BTW, I dreamt up, prototyped, blueprinted, and commissioned a 300-grain .45 Colt bullet for SAAs and leverguns operating at standard pressures. Tje concept was a heavy, slow, thumper. Main reason for the extra 50 grains of mass was so in a 20" rifle it would maintain as much KO power as possible when limited to 1000 feet per second....suppressed. It works out that max pressure with a variety of pistol/shotgun powders pushes it along at just the right speed to be nice and quiet in the suppressed rifles. It of course prints high from the revolvers out to about 40 yards, but only peaks out about 3" high so I can live with it. The other issue is stability. While Greenhill says it should be fine, 1 turn in 20" doesn't clump up the bullet holes made by the 300-grainers as snugly as it will with 250s.