How about 1400 rounds of a 163 gr bullet in front of 46 gr of 4831 at just under 2000 fps running 5"- 8" groups at 100 yards. No gas check and no discernible leading. Anything over 1900 fps will cycle the action if the bullet is heavy enough. It was all I had and haven't done it since but I'm thinking about doing it with my .308 Garand using the 145 gr LRN bullets that I use with the 30-30 for my next experiment. It's supposed to be a winter project so I'd better get cracking and finish my bench.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.