Getting good accuracy with 56.4gr H4350 and Nosler 120gr Ballistic Tip. Max is 58. Load development still in progress. Next will be trying to match the HDY 139 SST Custom factory load which is a beauty.
What's the twist rate? Here's two loads that shot well for my rifle this weekend.
120 Sierra Spitzer SP
Fed Primer, Fed brass unprepped
After zeroing, 6 rounds could be covered by a dime.
180 Berger XDR Hybrid
56.0gr RL22 (this is a hot load, work up to it)
Fed brass, fed primer.
3 rounds covered by a nickel at 100y, but the light shines at longer distances: 3 rounds covered by a quarter at 300yd.
I have not had much time (I just finished the rifle on Saturday at midnight) so I will be testing the loads further to dial them in some more.
Barrel is a 28" Shilen 1:9" twist
Actual chamber is a 7mm-270, but for ballistics/loading purposes it's a 280 Rem.
10 thou off lands
Wolf LR mag primer