Long Range 101 Part 33 - Angle of Fire Corrections - Rex Reviews 

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Had my math teacher told me this kind of stuff applies to long range shooting I would have paid a lot more attention in class....

We will show you guys how to use calc forms to do corrections for high angle shots. Stay tuned! :-)

This is a ton of work for you to be putting all this together. It's very much appreciated, so when you get aggravated putting it together just remember there are many off us following it learning from you! It's very much appreciated! There is no where else online to find this great of broken down information. I'd pay for it!

I am just about to upload the next video... sorry it took so long, lots of animations and pictures to dig up. If you are antsy, start logging you ammo velocities at different temperatures :-)

Wow am I ever exstatic I stumbled across your youtube page! The way you explain things makes it extremely easy to understand and follow along. I figured a quick thank you was the least I could do. Many many thanks Mr.TiborasaurusRex! Can't wait to start applying these calculations into actual firing solutions for my rifle :-)

Yes, sir. The next few videos will go into detail into advanced internal ballistics. I will cover a lot of things that should help you out.

Your knowledge is astounding - I'm barely halfway through this series and my groups have improved dramatically. I only wish I had found this series sooner. Many thanks for posting all of this information. Not only are my drop cards vastly better than before but my accuracy has almost tripled. Now my 500 yard groupings look as though I'm shooting at 200 yards.

I've been interested in getting involved in long range shooting for a couple years but never knew where to start looking for info. I am very thankful for the time you have put into learning about all this awesomeness and the time you've taken putting together your videos. THANKS!

Rex, thank you for making this series. You're giving us the great gift of your hard earned knowledge and experience. Thank you.

Thanks for the input, sir. Your commentary is always appreciated.

I check back every day to see if there is a new part 34 or more of this sniper 101 series posted. I've gotten obsessed. I got in my mildot master calculator, kestrel 4500, and angle of fire indicator today to mount to my rail on my 6.5 Grendel for now.

Hey Rex . I have watched all your videos . I watching them again to make sure I didn't miss anything . I purchased a vortex pst 6-24 yesterday . I am so stoked to go use all the info you have provided . Thank you thank you .

Rex, I can't wait until we are making charts, I've been watching from the start and look forward to each one. It's nice to see someone who can accurately and confidently talk on this subject and make it easy to understand for everyone. I've learnt a lot and every day one learns something is a good day. Regds Gordon Ireland

i must say this is a truly amazing video series. thanks for sharing your knowledge and taking the time to do it right

You're crazy well versed, man!! I really really appreciate this!! People pay ALLOT of money for this info and don't get near as much. Nor as in depth!! Thank you, I really do appreciate it!!

Thank you for making these series of videos, im just getting into Long Distance shooting and reloading. This is an invaluable series.

I definitely needed a refresher. Thanks Rex!!!!

God bless, amazing to share your knowledge, how truly of a blessed experience it would be to ever meet you. Awesome videos.

Thank you, Rex. I really don't have any experience to draw on for angle shots. Your videos are a great source of learning!

Keep them coming! I never knew that you had to use True Range for the wind. So glad I watched.

You sir, are my hero for posting all this information.

There will be a full video on range determination and range estimation.

Rex: Extraordinary video series. Thoroughly enjoying, and it's getting me back into something that I once was way deep into in another time and place. Hoping that you will get into some of the personal training you spoke of, and curious as to whether/how much you may get into custom/precision reloading for your long range work. It's something that I have always done to really make a rifle do what it's capable of. Pointing several friends to your videos as some of the best I've ever seen.

Great vid bud! I was looking forward to this because I'll be shooting in both mountain and flat lands. So I'll look forward to the setup for the mountains. :) I also wouldn't of thought that the higher degree would effect the shot more. Great to know! Thanks again bro.

Thank you, sir, for the great commentary.

Thank you for all your hard work! I appreciate your videos.

Awesome info... I'd like to expand on your point about using a GPS: you mentioned that you can find the acutal horizontal range by doing AHR = cos(ang)*true range, but most GPS units will give you AHR and leave you without true range. You should be able to find true range by using the inverse cosine (aka Cosecant): TR = (1/cos(ang))*AHR. Thanks for putting all of this great info together!

Thanks, bro. Thanks for watching.

I love geometry and those tutorials woke up in me the passion for long range shooting.

Thanks again! Looking forward to getting out in the field.

More mighty fine info! Thumbs up Rex!

Amazing videos. I've learned a ton and am telling everyone I know to watch this series. I just finished part 33 and dying for more. I've been obsessed learning here... haha. I'm building a custom .260 and a custom 338 lapua right now but have several others to play with for now

Rex,really enjoying this series of videos. Waiting impatiently for next one to be uploaded. I have used Exbal software for a few years - I can see there is one or more other factors to be taken into account at long range which the program cannot allow for (eg. ammo temp causing change in mv.) However, I have tried a simple comparison with Exbal and your method of calculating AHR to see if I understand it correctly. See part 2.

I prefer working in meters. The straight 10X optics arent more rugged than other fixed power optics that are higher in magnification but they are significantly more rugged than variable optics. The primary advantages to 10X over 16 or 20 are better field of view, larger exit pupil diameters and better light gathering. Also, the greater the magnification, the more optical imperfections are magnified, thus high power scopes need to have glass of extremely high quality in order to see better.

Thank you, sir. I appreciate it.

Great question. It seems like it should be that way, but it has more to do with actual horizontal range. 30 deg uphill and 30 deg downhill produce the same test results for vertical corrections, which confirms the physics.

Another outstanding video from Mr. Rex! If I may suggest a future video series it’ll be about long range skeet/trap/clays shooting.

First off I'd like to thank you for your effort & time put into this series! It's awesome what you do. You really should have a seminar or something as many of us have said we would pay for this info and your experience. I have watched the videos & looked through everyone's comments on this topic. I had the same question as rg006... Why do we not use the TR for gravitational effect? The TR being the hypotenuse is a longer distance than the AHR & therefore the bullet is in flight for a longer amount of time, giving gravity a greater amount of time to exert it's effect on the bullet right? At the expense of being ignorant, where am I confused in this? I thank you in advance if you have time to answer. Keep up the great work!

Awesome! Keep it up!

I HOPE THERE IS A NIC DVD COMING OUT FOR THIS... THIS IS INCREDIABLE!

As always a great video. A very good point about using a GPS to get horizontal range. You didn't point out that once you have the actual horizontal distance you can figure out the True Range with a little math. Simply divide the AHR by the Cosign and that will yield the True Range. So if you have the angle and any either the AHR or True Range you can get the other distance.

Rex, I just watched your vids on JBM and setting up ballistics tables. How can we use these tables to account for the different atmospheric and gravitational effects of a high angle shot? Enjoy all the vids!!! Thank you for all the knowledge and time invested in this project!

Great video, Wow, You've made a lot of videos. Thanks for the protractor angle device Idea. I realize its just a simple protractor, string, weight, straw and glue project but I got invested a bit deeper with it and I made one today out of a ( expensive office supply store ) Protractor that had its own pointer, which really was the reason i got a lil more invested in the project then I should have and a couple of ( store that only deals in dollar amount) toys. Oh yeah and some super glue from Wally World. I guess I'm just somewhat surprised how well the toy parts fit into the protractor. I'm not so sure it will survive a actual hunt, so I think I will get a mil dot master, but it was a fun little project to pass the time, Once again Great video and Thanks.

Thank you, sir. I will cover reloading very very soon - in the next section on Advanced Internal Ballistics. Peace.

We are only half way done with the series so stay tuned!

Terrific, thank you.

Yes, sir. It is equipped with a SWFA SS10X rear focus with a Mid-Dot reticle.

Thank you, sir.

Yup, basically you would adjust for all the 'normal' drop first using AHR and then correct for windage vertically still using the True Range - IF you are at a distance that warrants that precise of a correction. The actual deflection when shooting with a direct headwind or tailwind is usually minimal.

awesome video looking forward for whats to come. one quick question when I am using my kestrel do i use only density alt for my calcs or all individal atmospheric conditions ie: alt, bar, humidity, temp ext.?

Awesome, thanks! That's what I was guessing to do!

Ok, thanks. I the kestrel manual calls it station/actual (also absolute) pressure. It says to set the reference altitude on the BARO screen to "0". About to go take some measurements. Have a nice day.

Yeah, you lead will depend on the flight time of your bullet with your load at te exact distance you are shooting as well as target speed and angle. We'll cover that in detail very soon.

My Pleasure to show some appreciation. May be redundant, or of minimal additional information, but would be happy to add what I know to your efforts if it would be of any help. One of the things we did was to reload our precision rounds with a small kit in the field, with our prepped brass, always tried to police the brass. Crazy stuff for the times.

Hey, first things first. AWSOME video series! Secondly, I was wondering that does it matter if I take shop up- or downhill? I understand that the truerange and horizontal would be same but is there other variations caused by the angle?

Thank you.

got my rifle, bipod, sling today. base, rings, optics ordered and on the way. went weatherby 7mm rem mag topped with swfa 10x42 mrad. oh yeah!

Nice!

Thanks, man.

Yes, sir.

I'm watching this video for the third time while planning to make distance cut charts for archery.

Thank you Rex, Maybe a video about proper rifle cleaning and best cleaning tools. God bless

where do you get into actually splitting the elevation corrections between the gravitational component and the atmospheric component?

The .243 Win would be a real nice LR target rifle for sure. It will fly real nice out to 1100m. The optic should work fine if ya take care of it. Sounds like a sound budget set up. I would do the Bell and Carlson with aluminum v block over the Hogue for sure. :-)

We don't need no stinkin' hi-pot-nooses! I went hi-pot-noose hunting once, i missed!

lol, i guess i needed the brain torture, as wrapping my head around this was much easier as soon as i considered the long leg of the triangle. For some reason, i had gravity stuck on my mind as the largest error correction factor. The gig here, if i understand you correctly, the load does not know if you are pointing up or down hill, the parabola "lob" only minutely changes with gravity but the long leg is were we will make our corrections? great vid man

Hey I really find your vids helpful and where do u get all you ranging/ballistic data charts?

If you covered this I missed it. But I was reviewing the fm 23-10 chapter 3 sniper training manual. On the subject of engagement of a moving target I'm stumped. The formula is (LEAD in meters) X1,000 / distance to target = mil lead. I've ran the numbers starting in fps converting to meters. And using meters to begin with. Everytime I get the same mil lead minus or plus one one hundredth of a mil.

Thank you so much. Never taught this in the Army. Then again I was a flying warrant so....

Should be this week. I usually try to get at least 1 out a week, sometimes more. Depends on my schedule. I seem to keep more busy than I like. I usually have like 7 projects going at a time. lol

I am relatively new to long range shooting and I am having an issue with inconsistant shot grouping sizes. On any given trip to the range my grouping sizes can vary as much as 3/4". Are there any exercizes or tasks to practice to reduce my group sizes? Loving the series.....keep up the in depth descriptions.

You will be measuring your actual B.P. and not your ALT. ALT is usually estimated using the BP, so you don't need to worry about that. Also, you will need to know your ambient air temperature, and possibly your humidity if you are REALLY far out there, like 1500m+).

I stumbled upon your video series yesterday and have been watching all the videos. My local range goes out to 500 yds and local BLM about 900 yds. I've always used mil reticles for range estimation and then correcting for angle of fire as explained in this video. I'm thinking about getting a GPS (for fishing primarily) so my question is: When doing range confirmation with GPS there is no need for angle correction right? Since the two coordinates used to calculate range will give the AHR, correct

Hi Rex, I'm very new to this (never shoot) just started to learn through your amazing series. About the coriolis effect would you use the AHR, right? and the true range for the bullet spin drift? Ps. hope you are well now. Thanks for teaching us.

As a former US Military Sniper, I found this video to be very accurate. (No pun intended)

Hey Rex, thanks for doing this all. Two real fast questions if you dont mind. Do you suggest working in meters or yards (sorry if i missed that in a video). Also, SWFA offers a bunch of magnifications, I understand your reasons for choosing a single power, but does 10x provide more durability over, say a 12x or 16x? Thanks!

yup

i was wondering if you were going to go over the ballistics tables that you use. You talked about doing it. I have not seen any videos on it yet.

Wouldn't we select the drop values in our dope charts for 766 AHR instead of 1000 TR, so we don't shoot over the top of the target? Also, would we select our wind values for 1000 TR? Thanks Rex, your videos are amazing and greatly appreciated!

Rex, what are some things I can do now to get info started for all the ballistic calculations and charts we need to make? I have my round for a few guns developed. I know you said in one video to start checking the temperatures of the rounds with the temperature gun thermometer, then shoot them across a chrony...? so I need a list of like: Degrees in F = # fps With as much temperature range variation I can get... Then write down all the info for the temps and velocities to have ready..???

An uphill shot hitting high confused me until I thought about shooting straight up and how the angle difference between bore and sight would cause the bullet to shoot very "high".

Hi Rex First of all thanks for all the information- great job! a question about angle shooting: According to JBM's, shooting to a 1km get me a 29.2 MOA drop. shooting to a 1000 m at an angle of 30 degrees get me a 24.6 MOA Drop (matchs the drop for 905 m & 4.6 MOA Difference) but, according to calculation of cosine angle - the AHR is 866 meters - in this case the drop is supposed to be 22.9 MOA and the Difference is expected to be 6.3 MOA so, What is the correct calculation?

You will still need to know the TRUE RANGE to make all your ATM based corrections, but its true that your AHR will be used to determine your initial drop.

This is the first time ive actually seen some advanced gsce maths come in to play in a real life situation

Question,,, How would I reverse this equation.? Lets say all I knew was the Angle and the AHR, what would be the formula for finding out True range?

Actually, Your bullet drop, is just a function of flight time. The thing is that you adjust your holdover in angle units, but when you are shooting at an angle, this translates to a higher holdover in terms of meters or feet above the target. But the end result is more or less the same, the actual horizontal range is a extremly good approximation to be used when calculating the neccesary holdover angle.

I can see the internal ballistics playing a part in this though, so would I need to add in the chamber temperature to the list too, or try to get this info with the same temp barrel chambers?

Hey Rex - good Video - like everyone else here, there's heaps to learn, so thanks for the info. So what happens if we have a head wind or tail wind and we are shooting up or down hill.... so we use the AHR for the bullet drop, but the wind is on the True Range - both are playing with the correction up or down on the scope - so how do we account for that? Do bullet drop first, and then work out the wind adjustment and add that change on? Thanks heaps.

Do an in depth book/manual with chart templates and tell me where to order .

Hey Man, Rex thanks for all the instruction, love all your vids. Not to kick a dead horse or be a pain in the a*s but I'm just trying to bend my brain around this angle of fire idea. If I were to shoot straight down from a radio tower 100 yards tall wouldn't that bullet have considerably more energy at impact than if I shot from the ground straight up 100 yards to a target atop that same tower? What about the same scenario at 1000 yards? I remember throwing dirt clods as a kid at others and the guys on top of the hill had a definite advantage, but that's a really large slow-moving projectile, really the opposite of a bullet. I'm guessing the way to think about this is maybe that the acceleration due to gravity affects a really fast-moving projectile much less than friction from atmosphere, the same reason why terminal velocity will eventually happen over gravity or why a small meteor burns up before it hits the earth??? Later...

Not sure if this was covered in anyone's comments but if you get the AHR from a gps, or anything for that matter, you can calculate your total range. Where AHR=cos(40 deg)*TR, TR=cos(40 deg)^-1*AHR which is the same as TR=AHR/cos(40 deg). This is only beneficial if you have targets you know the AHR for but if you are still getting used to ranging targets this might help. Thanks for all the information you provide, I hope I can get into shooting long range in the near future. Do you have any tips on how I can practice this when the longest areas near me are usually sub 200meters? Thank you.

For angled shots I figure average elevation, and then drop for true range @ that elevation or (baro) then times that by the cos of the angle. basically drop@corrected baro x cos = corrected drop

thank you again for all the time you dedicated to making such informative videos. this series has been great, but I am having trouble wrapping my head around correcting for 2 Ranges. I understand how to get both Ranges, I am just getting confused on the correction for atmosphere at True Range and drop at ahr. according to my chart my rifle is 7.02m at Standard and 6.74 m with atmosphere corrections made. my drop at AHR is 4.49m. so how would I calculate actual drop? at 1000 40angle 85 temp

ok so, I would adjust the elevation corrections on the AHR(965m) not the TR(1000m) on anything greater than a 15 degree angle, as opposed to using the TR on flat ground, correct?

Rex, What can we do right now to get info started for our custom ballistics charts while we impaciently wait for more videos to come out?

Rex can I use this same calculation when working with yards?? Meaning cos(24degress x 765 yards = 698 yards? Thanks for spewing your knowledge all over everyone. I love it.

I'll probably use DA for now, since it doesnt require any reference input on the Kestrel and all i need to know is how thick the air is. Unless you say otherwise of course...:)

You can get you true range from the horizontal range given by the GPS if you know the angle on fire... It would be the GPS horizontal range, divided cos of the angle of fire... Cos()=adj/hyp

From his other videos that I've seen he's taken all of those into account. Might want to look at some of his past videos. Especially for longer range shots. But I might be wrong? I'm still learning and trying to get a handle on all he's taught so far. Let me know if I'm wrong Rex. :)