I just loaded up my first 30 rounds to do load development once my action shows up! (was scheduled for November, now pushed back to January)
I am building a 375 Cheytac on a Stiller TAC 408 action. Benchmark 1/10.5 twist. Will finish at 30", 1.250" no contour barrel/truck axle
. McRee chassis, which is now being coated in Multi-cam , Jewel trigger, BAT brake, NF 8x32x56 NXS with zero stop and high speed turrets, Ivey 150 MOA rings. Running the Sierra Match Kings, 350 grains.
Started with H50BMG powder as that is what I had on the shelf. Started at 128.5 grains and went up in .3 grain increments and stopped at 130 grains for now. Used OAL that I jacked from Cheytac's site, their "factory ammo" is loaded to 4.303" so I started there. Will toy with that once I get a few rounds down the tube. Used Tula Large Rifle Magnum primers. Got dies from Dave at Viersco, running the Lee 50 BMG press. Looking forward to burning some powder with this one and hopefully getting it pounding nails before next elk season and find myself a nice high vantage point!
I am hoping I can find a load that it likes with the H50BMG as I have 24lbs on the shelf!