I have worked up some whitetail loads with 139, 150 & 162 bullets in 7mm Rem Mag with IMR4451 & H4350. My elk loads in 7 are with Retumbo & 162 ELDX. I am quite pleased with 4451 results using 162 ELDX on paper & in the field. Very good SDs & groups. Velocities are respectable but not too high. Using less powder than H1000 & Retumbo thus helping reduce recoil a bit.
Yes Gavin, get a Mark V, you won't regret it. I have only used 4451 and 4166. Both provided best accuracy and best velocity in both 270 Win and 7mm-08 Rem. Wish I could still find them on retail shelves.
Hello Gavin! Awesome video once again. No matter what you decide to go with I’ll watch it and love it. Lol. I’m currently running 4166 in my 6 Dasher and getting good results. It’s a Dasher so it’s not too hard. It does gain a lot of speed when the temp rises compared to Varget. I run it slower (2800) to keep from getting heavy bolt lift at higher temps. For competition shooting you need to know how to run the Kestrel for temp. sensitive powder to stay on target. Especially when the morning temps are 55 and the last 4 or 5 stages are 80 plus degrees. Keep on keepin on 💩
I run 7977 in my 25/06 behind a 115gr Berger and it's a laser beam, both in velocity and how it prints on paper. Definitely a gem I found in a world of not many gems to be found while hunting for H4831 and H1000.
Great video, I've been wondering about 8133 in 25/06. I use Retumbo currently. I would definitely get the 257 Weatherby, and will be looking forward to videos on it.
Gentleman great data on these new enduron powders! Im getting ready to test 7977 vs 8133 in my 7mm rem mag im going to be loading 160 grain nosler accubonds and 175 grain partitions. I'M laid up right now ..just had ankle surgery hopefully very soon i can get out with the chronograph and get some numbers ! I was able to work up some loads to test I was very thankful and fortunate to be able to obtain a couple pounds of these powders. Thanks again for your great videos!
@@diesleboy84 that's good velocity with a 180 .....I was hoping to get that with a 175 now with your data I'm sure of it!! Thankyou for the information
I use IMR8133 in my 25-06Rem & 300WinMag with heavy for the caliber bullets. I've started experimenting with loads that the manual or GRT says are 'compressed' or really close to compressed. I'm using a 20" powder drop tube to get a more consistent compression of powder thru the powder column. It's dropped a couple loads with SD in the teens down to single digits. YMMV.
Just finally got to this video. I have been using this in my 338-378 Weatherby Mag. Since Retumbo is not available. It has been shooting great with the 300gr Bergers. Also for a solution on the large volumes used on this caliber. Military powder IMR 7383 and WC857 have been good choices as well.
Nice you test it for me I have bought 5lb last year never touched it but hope to try it this year with heavy bullets I’m my 300 Norma mag prob gonna start with 245 Berger hunter elite I usually use m570 or n565 but exited for this 8133
I am testing IMR4451 for my .270WSM and my sons .30-06. So far the '06 loads grouped well and the .270WSM had good velocity. Used 2 different methods of load workup. I seemed to feel less recoil with this powder, could be my imagination tho. I have used Reloader 22 for both these rounds and had great success.
I like that you break down things to a science. I get a lot of insight from your channel. I have a question however. I seen you had ramshot Magnum on the table. Do you have experience with aliant magpro? I bought 8 lbs hoping it will work well for my 243. Great velocity, crap SD, builds pressure fast, and my rifle turned into a 2" gun. Normally it shoots 1/2" with 105s and below. I tried in my 7mag, and played around with some light charges in my 30-06. Both are normally 1/2-3/4" but with magpro they shot 1.5-2". Any advice?
Burn rate is not the only thing to be considered. The relative velocity versus relative pressure is something to be considered. Norma does an excellent job at explaining this.
I just tried 24N41 in my 25-06 with 133gr Berger 2848fps using 61gr of. I don't think that it's an optimal powder however it's neat that it works. Thank you for the videos and opening my mind to the idea of the slow end powders and see what works out. I'll run another test and let you know what the ES & SD of the load is.
Yes! Please buy a Mark 5. I have one in .300 wby and love seeing more content about the .257 wby. I’m looking at buying another in .240 wby for Coues deer.
Speaking of slow burners, I still have a pound of H5010 in my powder collection. I don't have any rifles suitable for such a slow burning powder any longer, but I recently inspected it and it's still in fine shape, so I'm reluctant to just throw it away.
I'm a new reloader. I've been loading 45acp with Winchester WST powder..and love it. Can not locate any more WST..anywhere. any ideas or equivalent powder for 45acp?
Very informative issue. There are some points I think you should cover perhaps not in the powder reviews but maybe if and when you get that MK V Weatherby in 257 Wby. Mag. First issue is barrel length and magnum cartridges. Many modern rifles have 20- or 22-inch barrels and this ratio to powder efficiency. The other issue is leade and/or free bore with the added issue of throat erosion creating its own version of free bore. Curious minds want to know.
I went with IMR 7977 at first for my 7 mm Mag. Then 8133 came out and I picked up 3 pounds. The 7977 produced outstanding groups with 162 gr. SST Hornady bullets, I have yet to load the 8133. I believe Hodgdon said IMR has suspended production on the Enduron powders.
Well, now I have a new powder to try in my 25-06. I was migrating to lighter all copper bullets like Barnes TTSX, but if I stay heavier to caliber, then 8133 gets a nod.
I love the 257 Weatherby. I would highly recommend it. And if by chance you reload it with IMR 8133 could you please direct me to where you got your starting load. I'm shooting a 100 gr accubond
What do you think about the WSM cartridges with this powder? Seems like it should work reasonably well. This is getting me pumped for my new 25-06 build!
I don't think you will have much luch with the 300 WSM and this one, 7mm or 6.5MM maybe. Reason being is bulk density, this is a LONG stick powder and doesn't fill a case the same as something like Hunter or Magnum would.
2 questions... Weatherby mk v? Yes... Enduron powders? Haven't tried them yet. Sounds like that one would also be good for 300wm and 338lm though... Vihtavouri does a great job at quantifying with their burn rate chart. I just wish they'd update it with the newer powders and maybe make the chart bigger to fit those extra powders in. It's a good visual as is though!
Would love to find some 8133 along with 7977 to try out in my 300 prc. Haven't seen them available in the last year I have been looking. Great content on the channel. Would love to see your take on a 7mm- 300 PRC. Sounds like this will be the 7 PRC we've been hoping for.
Just use H1000, and thats a big negative on the 7mm-300PRC.... hint there is something called a 7mm LRM and its less over-bore and VERY accurate/consistant and already based on the same case as the 300 PRC. The case is 375 Ruger for both.
I decided I would try some imr4451 in my 6.5x47 really no loaded data published that I could fine. Man that stuff behind a 144 grain Berger hybrid shoots light out 1 3/4 in group at 600 yards this weekend shooting sd 1.4 and es 0f 4 that a ten shot string
Me once again.Would be nice to see if you could also do a faster twist barrel which will handle all bullet weights from 115gr to 135gr and less freebore but bullets seated out so far that they just,just fit in the magazine!I think this will be an awesome cartridge for long distance and with hard bullets plenty enough for elk!Looking forward to such an project and I see here are more people who want so see this cartridge perform with heaviest for caliber bullets and faster twists with less freebore.Hopefully you decide on this project.I lookat all your shows,they are all great.
The only reason you shouldn't buy a Mark V in 257 Weatherby is because you should buy two.... Which I fully support. The Mark V action is very cool and I would love to see how much accuracy you could wring out of one with a custom build.
Try the IMR 4955. It is in the 4831 burn speed range. The 8133 will probably burn to slow. Most of the '06 case cartridges like the 4350-4831 type powders the best.
use something a little bigger for animals at long range. The .243's are great for prognhorn and whitetails at under 5 football fields, other than that I would pass. there are several reasons why this is a bad idea, the 2 main ones being 40% less projectile mass compared to the 7mm's and less BC. Velocity doesnt equal good /clean ethical kills at long range, High BC and mass does. We owe it to not make our animals the experiments for our minimalist attempts.
@@timothyshaw6118 no kidding detective, now go find me a .243 bullet that carries as much energy at 700yds as a 180gr 7mm or 215gr .308 I shoot 6mm’s all the time at 900yds, even with the highest BC bullet at 3k fps they are like a bug on a windshield compared to a heavy 7 or 30. The 6mm has its place, it just isn’t as ethical on big deer or elk at extended ranges.
@@christopherbenfield7848 I didn't buy a 6.5-300 because I thought the barrel was going to last for thousands of shots. When the barrel wears out I'll get a new one.
@@scottrossingnol6034 Understood, but it's not about round count. Its also shot to shot velocity migration and the quality of brass. There is a reason serious long range cartridges aren't that overbore or have that much freebore in the chamber.
@@christopherbenfield7848 I'm not implying it's the best 6.5 cartridge available for long range shooting. For the distances I personally will shoot in a hunting situation it does everything I want or need it to do.
I posted this in the Retumbo video, but I wasn’t impressed with 8133 in my 6.5-284 (pretty much a ballistic twin of 6.5 PRC). Shooting 147 ELD-M, I was able to get 2786 fps (avg of 3) with 57.0gr from a 24” tube. RL-25 works much better in that gun, with the same bullet I was able to get 2888 fps (avg of3) with 55.0gr on the same day. The barrel is still pretty new. Maybe with a 26” tube it might work better.
Primers are hit and miss online on all the common websites. Just check once a day. Powder is available constantly now...just not maybe your choice brand.
What are some clues a reloader might look for that indicate a powder is too fast or too slow? This could be addressed in terms of safety, or maximizing accuracy
In most cases if a powder is too fast you will notice pressure spikes and lower velocities. And if a powder is too slow, most tomes you may have trouble getting to the higher velocities due to not creating enough pressure….
First and foremost, I have to say, I love your channel and what you do… But, I just have to say, I haven’t been able to find any powders anywhere. BUT! That being said, I was a bit baffled by your 300 PRC load information with the 212gr ELDX bullet… I don’t have a 300 PRC but I do have my trusty 300 Win Mag and (IN MY RIFLE) I’m using 77gr of H1000 and the 225gr ELDM, seated to 2.880” CBTO or roughly 3.665” total OAL. and getting 2940 fps. Again, in my rifle, these loads are completely safe and am getting to my 4th loading on my brass, and shooting about 5/8 MOA on a 400 yd target…. I realize the longer length helps tremendously with the results I’m getting, but just thought I’d share my info…. Thanks for everything…
@@jefferywilliams7687 Im glad you were lucky and got a good one. Weatherbys are well known to have excessive freebore. mine has to be loaded almost 300 thousandths extra long to get sub 3/4 moa.
@@jefferywilliams7687 .257 weatherby mag, stainless fluted barrel, black synthetic stock. bought it brand new in 2000. it shot 3" groups at 100 with factory ammo. with some fine tuning with hand loads i got it down to 3/4' groups at 100 yds. My budy bought a 300 in same gun at same time and he had the same results as mine.
@@williamhall7647 I own 3 -257 Weatherby Magnums (1 Mark V & 2 Vanguards). I own a 300 Weatherby in a Mark V. Re-barreled it and Killed a nice 6X6 with it this year. Now I have to back up. The rifles you have were made when everyone trying to make a $350 rifle. I have bought many of them for $499 and turn them into re-build projects. Just finished a 340 for my son. Your issue has nothing to do with the freebore. It has to do with fiberations and lose fitting stock. All of them have forearm contact built in. If you know how, pillar bed the recoil lug. Make sure to use studs and do not change the original height. Then see how it shoots. May have to sand out the fore end contact point in the stock. In addition make sure you screws are tight and do not touch the bolt. Some of the “mountain” rifles were built with too small of a diameter barrel to have been fluted. In order to shoot groups you have to shoot them 1X and let it cool. If not, they will walk. My next to oldest sone got 240 and it was a pain until I bedded the action floated the barrel. When I chamber Weatherby Rifles I ask customers to send three dummy rounds with the bullets they want to shoot seated out to the end of the magazine rail. This give you more powder capacity in the case. I took off the pencil thin barrel on my 300 and built one with a fluted barrel with a .695 muzzle diameter. 300 Shoots 180’s just south of 3,300 fps with 180 Partition out of a 24” barrel. I use Weatherby/Norma cases, Federal 215M, as much RL 26 it will handle and 180 Partition. Rifle is sub 1/4” MOA 5 shots. My 257’s like the following: 115 Nosler Ballastic Tip and 115 Nosler Partition. I use only Weatherby/Norma cases. Federal 215M. As much Reloader 26 that it will handle without excessive pressure. The loads chronograph at 3,476 with an SD of 6! The barrel is factory 24” # 1 contour. Only about 15 FPS slower than a 100 grain bullet. The wood stocks come with bedding compound and and aluminum reinforcement block in them. If the rifle hits your zero on the 1st dirty cold shot. You have a good hunting rifle. Rarely do ever have to anything more than once with the 257. Varmint gun/prairie dog gun will be a different story.
50 BMG is very accurate out of my BAT EX action. The only problem with BMG is that the industry will not supply quality brass. With Lapua brass it's a 1/3 moa rifle. I don't like all the PROFITEERING in the industry today.
Why does everyone think you need a “tough” bullet for elk?! The depth to vitals is only 1” deeper than a whitetail! The shoulder and rib bones are only 1/10” thicker than a whitetails! Its a much lighter constructed animal than everyone makes it out to be.
Angle of shots and sure size of body cavity. However, I do think you can get way too tough of a bullet. Need one that does hold up to the velocity of the cartridge you are shooting at impact distance. I prefer the Nosler Partition I have used the Speer Grand Slam, and Norma Soft Points all with success. I have seen more game wounded when shot with bullets that are too tough. They function more like FMJ’s. You made an excellent point given all the hype around certain famous bullets.
@@chevyon37s You are correct and back East hunting whitetails, you don't need a large caliber rifle. Most shots are less than 100 and a .223 is plenty. Out West, it depends and can be 600 + yards. Not that I would take a shot at an elk over 600 yards, but the magnums excel at the longer ranges, but there are other non-magnum calibers that do also. Now, that doesn't mean you can't get close to elk or take an elk with a caliber under a 30 caliber, that is not a magnum, because you damn well can.
Fragmentation projectiles ( non bonded) are a poor choice for elk, Nosler ABLR, partitions, Swift A frames are better suited for larger game.. extremely fast rounds tend to frag on impact at closer ranges (within 200 yard range)
Yes....BUT DO TRADES.... WE LOVE TO SEE MULTIPLE DISLIPINES COMPLIMENT EACH OTHER. WORK TOGETHER ON A PROJECT! ! ! ! REACH OUT.. I AM SURE THEY KNOW WHO YOU ARE... WE WOULD LIKE TO SEE YOUR STRENGTHS BLENDED ON A PROJECT......
I know that IMR8133 works in the 300 PRC, but thats aw hole lot of powder, compared to the same /better velocities with H1000. 77.5gr in Lapua Brass = 2950 and 3FPS standard deviations....The tried and true still has the goods.
I never had luck with h1000 in 300prc. Imr8133 worked immediately better for me. 225 eldms with 78.2 grains of imr8133 pushing 2758fps with an outstanding 2fps standard deviation with hornady brass of all things shocked me. I could never get my sd numbers under 20 with h1000 for whatever reason.
@@orangerider2827 haven’t tried the H1000 with that bullet, only the 212 ELD-X. I have some 230 A-tips and IMR 8133 is top on my list to try with those
@@christopherbenfield7848 interesting I've never shot that light in 300 prc. I put more effort into h1000 then imr8133 just couldnt get it to work. Plus around me I could find more imr8133 so worked out for me.
@@christopherbenfield7848 I've just been using hornady brass. Along with there match grade bushing die. I dont remember the diameter would have to look. I have some adg brass but with number my hornady brass shockingly produced I wasnt changing it out haha.
Firstly, whenever the question is, "should I buy x Weatherby?" The answer is always yes. But what I'd really like to see y'all do is take a 257 WBY Mark V, and do a custom rebarrel. Up the twist rate from 1in 10 (or 1 in 12 for an older one) to 1 in 7, and shorten the throat a bit (Weatherby chambers always have a long travel to the lands); And see what the cartridge can really do with something like a 135 grain Berger Hybrid! Lots of work, but imagine the payoff at the end!
There is a reason why there is a long distance to the lands. Weatherby knew that because of the long bullet jump it resulted in a "bigger" practical case volume when the bullet came out of the case but before the bullet hit the lands and create resistance force to allow for that much powder without blowing up actions.
The reasons why you should NEVER buy a Weatherby far outweight the reasons for, but heres a few. NO aftermarket support for better parts/upgrades. Brasss IS WAY WAY overpriced for the quality. Overbore = short barrel life and inconsistancy. lastly the affermentoned LONG jump to the lands and the way factory rifles are chambered...hard pass for me when there are SO many other equal/better cartridges and rifle actions.
@@dustincowan5427 Exactly, and let's not forget he was working with metallurgy and machining from the 1940's. The man was pushing the technological envelope of the period, which is why the throats are deeper than cartridges developed later. Doesn't mean you can't modernize the throat design for modern technology. As far as overbore goes, any high velocity Magnum is going to be overbore. If you don't complain about overbore on 6.5 PRC you don't get to on 257 WBY either.
I have a custom 257 Wby with a 25” barrel. It’s a 10 twist with a SAAMI Weatherby chamber. It shoots 115 VLD at 3600+ fps and prints .2” groups. There is not a thing in the world wrong with a longer freebore and could be easily argued you could never get that kind of performance without a long freebore. I’ve pushed it to over 3650 fps before any pressure signs started showing up.
@@mikedoyle7020 agreed, but you would need to up the twist rate for the new +130 grain bullets. Which imagine the long range potential of that 257 WBY with a 26 or 28" barrel and a 139 grain black jack
I would have nothing against the 25/06 if it had a 1 in 8 twist and shot 145 grain bullets. For reasons beyond my understanding the twist is too slow and the bullets too light!
@@juliusjames5577 You know your absolutely right. Now that I swage my own bullets. Thank you! You just thought of my next project for me. I'm old, and we didnt used to have all these choices. I gave up on that Idea decades ago. B. A.T. Machine. Here I come.
