Northwolf--That Greener would be great with heavy barrel. Someday I want to do one. Ok, I shot a banded 12ga slug that greg designed with 750 gr, only 3 bands, and bottom of the grooves smaller than land diameter, ans wa sable to shoot same velocities as hard lead slugs with same pressure. Other banded types raised pressures to get same speeds.Speed was 2700 in our long case in the Savage. Ed