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Thanks Mike. I have the final piece of information to compare QL and GRT to the actual data from my rifle.

I'm in need of some 224 Valkyre QL data using IMR 8208 in a 20" 1/6.5 twist launching 80 gr. Berger VLD bullets at magazine length. Much appreciated. John

Not much of a count, but I have fun hunting even if I don't bring anything home. 338 WM in the coastal forest of Oregon Coast. 280 AI on the high altitude grass prairies of NE Oregon.

GRT predicts 13.0 gr of H110 resulting in 1800 fps @ 25kpsi

H110 has been said to be the original 30 carbine powder, if not it's close to optimum. At a 1.940" LOA, 16.0 gr. of H110 has a 98% fill and GRT predicts 2125 fps @ 45k psi out a 16" barrel. I tried single loaded 110 gr. SP bullets out of my M1 carbine and the 1/20 twist didn't spin them fast...

Low velocities as in subsonic? If so, 4227 and H110 burn rates are too slow for the application. 3 gr. of Unique would be subsonic, but the chamber pressure would only be ~9,000 psi and have less than a 40% case fill.

In my 7x57 fitted with a 24" barrel I use: 50.0 gr. of RL-17 pushing a 140 gr. NBT at 3070fps according to my LabRadar. I also have a stash of 170 gr. Lapua ammo that clocks 2632 fps.

That's a neat mount. Wouldn't it keep you from taking down the rifle, not that it's frequently done.

9.3x62 predates the 30-06 and delivers more zing than any of my Whelen rifles including the 375 Ackley. Pick you favorite sub-30 caliber cartridge and the 9.3x62 and you're set for anything in North America

I love running cast through my 375 and 416 rifles. Of late I've been using IMR 7383 because its bulky and I have a bunch of it.

If the 30-06 factory ammo was loaded to the same pressure as 270 ammo, there would be less 300 magnum rifles sold. With RL-17 and H4350 I can crack 2800 fps with a 180 gr. bullet out of a 22" barrel.

I was using GRT and with a 26" barrel and SF powder pushing a 130 NBT simulates to 3300+ if the rifle has a long throat. My 270 is a Rem 700 with a 24" barrel and I shoot 130 NBT into tiny groups with 57 gr of RL-17 loaded to 3.378" and according to my LabRadar it's doing 3234 fps. That's a...

I would cast a vote for the Remington PLHP bullets as they are the only bullet I've spun to disintegration in a 1/7 twist 223 barrel. They hold together in a 1/9 twist barrel and are devastating on critters.

I have a reamer if you want to borrow it. John

Owning booth a 270 and a 264 WM, in my rifles the 270 is the better choice with 24" barreled rifles. It has been difficult to get much over 3000 fps with the 264 pushing 140 gr. NBT with a variety of powders. My 270 pushes a 130 gr. NBT at a screaming 3234 fps with RL-17, while the 264 burns...

I have a 7x57 rifle built by ACGG member Larry Brace on a Husqvarna action with a 24" barrel. Lapua 170 gr. factory ammo delivers 2632 fps out of my rifle. My hunting load is 50.0 gr. of RL-17 pushing a 140 NBT downrange at 3070 fps. With modern powders operating at modern pressures this century...

Have you tried contacting: https://thegunworks.com/ They're my go to place for muzzleloading supplies

I was in the 280/280 AI fan since the late 70's and never owned a 270 until 2022 when I picked up a plastic stocked M700 in 270 at a local pawn shop at a bargain price. My thought at the time was that it would be a loaner rifle or a truck gun, but since ammunition was scarce and I had bullets...