For those velocities try the medium rate powders, 3031, W748, HBLC2 ect. I have had some luck shooting lots of surplus 4831 in an 06 however.

Aladin -

Regarding .002 oversize for military bores (good shape) what about sizes for 2 groove vs. sizes for 4-5-6 grooves?

Or boolet styles - I assume bore riders would do well for 2 groove.

Trk I have no 2 groove experience, but I still believe the internal dimensions [the least amount of runout] of the bore dictate how close to actual groove dia the bore will shoot well at. I'm sure you know the 2's have 50% of the land engraving the bullet vs the norm of 25% for 4's and 6's. And the 2 is synonomous with the long rider designs.

IMO if your using just aged ww alloy the load itself is more important to accuracy than any bullet size-- if it's big enough. Barrels make the best sizing dies.

My 1903 springfield liked the bullets sized to .311". Cast very hard, wearing a gas check. IMR 4895 powder. Sorry i could not find the loading data for it, it is long gone sorry to say, one of the gun i should not have sold.

For best accuracy you should ignore bore diameter. Either "slug" or make a cast of the throat of your rifle. Size your bullets about .001" smaller than the diameter of the throat.

Exact throat size, or even .0002" over throat size would be even better for accuracy, but wouldn't work well in a hunting rifle where you may have to extract a loaded round without leaving the bullet stuck in the barrel throat.

Bullets of throat size or very near to that, both center better when chambered and also obturate the bore quickly on firing. Quick obturation keeps powder gases from gas-cutting the bullets, and also significantly contributes to preventing leading.

AC