Paul B.
That was the final load before WWII, and ran 825-835 fps from a 5" tube, IIRC. More recent load data uses a 236-grain RN bullet over SR 7970 loaded to 885 fps. I've never seen that powder available to the public. VV N320 comes close on performance.
L. Boscoe,
Yep, N310 is way faster. Hodgdon Clays is similar. The high burn rate lets you use less powder, which reduces recoil, but you will go over pressure if you try to load it up to the velocities achieved by slower powders. Great for target loads but too quick for full-power hardball.
