RE: 7x57 Mauser
Capt.:
I have loaded the 140 BT, but my 7x57 really likes the 150 gr bullets. The 139 gr Hornady Interlock shoots really well in my rifle too, not sure why the 140 BT's don't group at any rate. The powders of choice in the 7x57, H414, RL19, and IMR 4831.These give me the best accuracy and velocity.
Cheers,
35