IMR 7828 and Weatherby are like peanut butter and jelly

Great video, and I hope you don't give up on it. In my opinion h1000, or retumbo would probably produce better accuracy, and be better velocity with that large of a bullet, but you never know. In my opinion, if the cold bore shot always hits the same spot, a tiny group size isn't as important.

i would like to see a 25RPM and be able to shoot them bigger sleeker bullets. i imagine that eventually we could see a 140 grain or even a 150 grain bullet in the future!

You have great taste Austin. If I could afford several cartridges to add to my collection I really like the 300 Weatherby and the 257. I live at 5200 elevation but it doesn’t help my bronco engine eat enough 😂

Try seating the bullet out some more, you have plenty of freebore using a longer, heavier lead core bullet. Also, try H 1000 or RL 25 with a Fed 215 match primer. I have the same exact rifle and it works great for me.

I would try the next slowest burn rate powder , that might be the ticket ! I think 7828 is slightly faster than optimal for the 135s . Maybe an RL 25 or Retnmbo could work , I think it’s worth a try !……..

The Berger data is interesting coupled with real-world results. Since G7 BC is for long-range considerations, it would be interesting to see how these loadings perform out to 400+ yds.

135 grains is right in the wheelhouse of that new 270 WSM I just picked up. Even though it may be possible to shoot bullets heavier than in published data per caliber, it just seems to me like the rifles perform best within those specified bullet weight parameters. That's why I own so many I guess, rather than try to cook up loads I hope will work. After all, the gun, powder, and bullet manufacturers have done a lot more professional testing than I'm ever going to do. Had a buddy whose 300 WinMag blew up on him trying to push heavier bullets at higher velocities. He don't do that no more.

Hope it works out for you. I enjoyed your effort on the 270win.

I wish they would produce ablr around 125 grain

Interesting, at your high elevation it probably will work. Hopefully you will get some good accuracy out of them.

They could be alittle rear high but I would say you could probably get that out with a powder charge. I’d love to see this work

Grab ahold of that rifle like you own it. 😊

I use a 7.5 twist on 135

Its happened to me twice now, with marginal stability situations , they shoot and group well at 100, but at 200 and beyond the groups open up really fast and there’s evidence of key holing starting to happen.

Hey I wanted to tell u that I picked up some what I believe are old school Nosler Partition lathe turned 200 gr .30s I’m gonna make loads with them for my 300 Wby, hoping to use these on elk in Wyoming Lord willing. I figure they would make good elk medicine.

The new Weatherby riles can be ordered with a different twist rate barrel....

For both his magnums compressed loads of h4831 would without a doubt in my mind solve his moa issues guarited

Seems to me the top of the bullet hole is torn a little more than the bottom. Those 92 g HH had nice clean holes. Shooting at farther distance may tell more. Maybe try 7977 powder if you can find some.

We need berger to get on the ball an make some 115gr again there all but gone now days

I want to congratulate you on what appears to me a successful experiment that challenges the established "understanding" of ballistics. Too often, this community, and the world writ large, seems to take established parameters and never even thinks to question whether this is a boundary that can be pushed. The "math" says its impossible and therefore dont even try... but as you are discovering, maybe the math is overly conservative or incorrect itself? My wife is interested in trying .257 Weatherby as her "big gun" down the road, this has given me quite a bit to think about concerning the calibers flexibility..

Given the velocity of the cartridge and the heat you'll generate, methinks you need to try one of these loads in a target rig, rather than a hunting rifle. Specifically, a fat, or "bull" barrel.

You gotta have the twist rate to stabilize the bullet

Try to do Horndady 250 gr A-Tip on the .300 Weatherby!

I wonder how they will be flying out at 300-400 yds?

Austin I’d use it, first and second shot were close I’d use it to my hunt that third shot still in kill zone for anything ur gonna hunt

See stability at 300 yards

So...did you go to the range after church...or is the button down dress shirt your range shirt? :)

Try 63 grains of H1000. Or retumbo.

What are you shooting at, 25yds?

I tried the 165 ABLR in my 1:10 twist 270 WSM and they did not stabilize. I plan on trying them soon in my Ruger American 1:10 twist .270 Win.

3150 fps?

The bullets will wobble. Going to lose huge amounts of BC and performance.

Flyers don't count...