Quick Tip: What Is Ballistic Coefficient? 

HELL YA BROTHER

How do you know it was coffee? whiskey fits in those cups too

The simultaneous sip.

Laugh ass my off

The Tandem Two!

I think it's a meme now. Keep it up. Good job guys.

We feel this...

Speaking of wind and drag. I use my Wonder Woman coffee mug, and her BC ain't so great, got a couple of round nose soft points if you know what I mean, but fun to drink out of.

Haha there is legit a hair tutorial on his instagram!

Way interesting!!!

Thanks for watching!

I think that is one of the reasons .30-30 or .30 WCF has been so successful at dropping game even though it is not a ballistic marvel. Moderate velocity with larger bullet area at the point of contact, thump and shock. I use 7.62x39 PPU 123 grain round nose soft point ammo for shooting Texas hogs and it is very effective. I have just put together a 350 Legend with a 16" barrel for shooting hogs, with similar velocity to X39 but with heavier bullets like a .30-30 it should be devastating on hogs, much like the truly Legendary .30-30 but in an AR platform.

Thank you!

Are you saying barrel length has an affect on ballastic coeffecient? How so?

@@countryfriedent you can get more fps from a longer barrel for a centrefire. Speed can effect BC. Where as a longer barrel in a 22lr wont make much difference but if a 22lr burns everything in 14 inches then at 22 inches you can get friction that can negatively effect BC which can be opposite to centrefire. For centrefire manufacturers use the longer barrels so they can get the optimal velocity to get the best BC. Using their information for Ballistic calculators will get you ball park but for precision shots at longer distances it wont cut the mustard. Hope that helps.

Chrono your forearm? Yeah, this guy knows what he's talking about.

@@adrianwhite9365 i see.. thank you for the reply. I thought it was only the aerodynamics of the shape of the bullet. Good to know!

@@adrianwhite9365 Thanks for the explanation. In addition to the information from the video. You havd helped clarify a couple of points. Thanks again.

Thanks for watching! Enjoy!

G1 is an old BC model, it resembles older designs of Tangent type Ogive bullets without a boat tail, and some old artillery shell designs. The newer G7 model is more akin to a longer Tangent or Secant with a boat tail designs. All projectiles will have a G1 AND a G7 number, but one or the other will be more accurate at some point in the calculation of the trajectory for some reason. At that's because the model is just an estimate, it's not actually calculating how that actual bullet shape behaves, just how a shape kind of like that bullet with similar weights and speeds behaves.

Well ... that is not entirely true. The BC number printed on the box by the manufacturer is the “official BC” of the projectile. The actual BC exhibited by the projectile is affected by a number of things though the bullet manufacturer will typically communicate the most reliable average when taking these things into account. Some (but not all) things that can affect a bullet’s BC are: 1) The consistency of bullet manufacturing This is why “match” bullets typically cost more than FMJ and other “plinking” bullets. The manufacturer goes to great lengths to produce projectiles that fall within a small range of BC values. 2) The barrel the round is fired through. The type of rifling and number of lands/grooves in the barrel and the size, tolerance, consistency of the bore and dimensions of the throat all deform the projectile when it is fired and therefore change its effective BC. 3) The shape of the projectile and velocity the it is traveling through the air Depending on the shape of the projectile (flat/boat tail/rebated boat tail/etc. ogive profile, ...) the BC of the bullet can change based on the velocity that it travels through the air. Different BC models (G1, G7, etc) help account for these differences and if there is significant enough differences the bullet manufacturer will communicate this in their documentation. (Just remember to compare BC values that use the same BC model to get an apples-to-apples comparison. G7 BC values are about, but not exactly, 1/2 the G1 values.) To determine the “true BC” a bullet has when being fired through the barrel of your gun you really need accurate velocity and actual bullet drop information. You can then plug all this data into a ballistic calculator (I.e. StrelokPro) and you can determine the “actual BC” you would need to use to generate highly accurate ballistic tables to use with the projectile and rifle combination. The long story short if this is that most people can pretty much trust the BC number on the box for the type of shooting they are doing. (This is all assuming a reputable manufacturer of course.) The “numbers on the box” that are much farther off from reality and most likely lower are the velocity figures. Those often are off by hundreds of FPS compared to what you will see in your gun.

@@roncterry have you talked to long distance shooters about that? I took a course from a couple, and their advice was that in actual use, BC's often do not stand up to manufacturer's numbers. If you use a Kestrel, you may find you have to dial your BC downward quite a bit to match reality. My teachers told me manufacturers were pretty much full of it when it came to BC's, and sure enough, I had to adjust mine when we started shooting. My ammo's maker put .462 on the box, and my instructor had to change it to .420 to get things to work hundreds of yards out.

@@thebubbacontinuum2645 Much like when a "new" cartridge is introduced and the manufacturer touts the great velocity numbers. Only to find in the small print that the numbers were obtained from a very long barrel, not the average length barrels used by most shooters and hunters. I know a lot is just industry hype and marketing, but I think especially in the era of the AR they should give numbers based on common 16" or 18" barrels as well as the long 24" barrels and should probably include shorter barrel "pistol" velocities because of the popularity of AR "pistols".

Barrel length is the main variable to look at. Hornady typically states that their tests are performed with a 24" barrel... I don't own a rifle that has a barrel over 22" so my MV is already going to be under the published velocity... So my BC will be lower as well.

@OldSchool Jack - Actually, no. The BC of a projectile has nothing to do with the barrel length. The BC is a measurement of the aerodynamic nature of the projectile. A bullet has the same BC whether it is being shot out of a 10” barrel or a 30” barrel. The length of the barrel affects how fast the projectile is moving when it leaves the barrel, the BC affects how fast the projectile keeps moving as it travels through the atmosphere.

@W. & J. Buchanan - Actually, you might be surprised. A lighter bullet moving at a much higher velocity will have more energy for the first few hundred yards than a slower heavier one. The heavier higher BC projectile will only have higher energy at a longer distance. Take for example a 55gr .224 @3200 fps vs a 77gr .224 at 2500 fps. The 55gr has more energy until around 200 yds where the 77gr takes the lead. That doesn’t mean the heavier projectile doesn’t have other advantages though. I personally am a fan of the 75-77gr .224 bullets as well but you just need to know the velocities you get out of your gun. For example, I only get ~2500fps from a 75gr American Eagle load out of my gun but I can consistently shoot 1” groups with it. I get ~3200fps with M193 but can’t seem to consistently get better than 2.5”-3” groups. I’ll take the slower more accurate round any day of the week.

They have good bc but ideal is 6mm to 6.8mm somewhere in between there. That’s why the competition guys use either a 6mm or 6.5mm.

@@drdes9609 do your conversions those numbers represent the same size projectile.

Metric designations seem to shoot better, something to do with the decimal point being closer to the center of the number.

Blair Buskirk somewhere between .240-.270 is the sweet spot and many people thinking its .243 for those who don’t use the metric system. It’s not the same as a .276-.280

Math is what has created all the cool weapons and bullets. Math is what tells us how the bullet operates from primer strike to bullet strike.

This may be more true than you know...