Mike in Ct,
Many years ago when I was hunting rabbits using shotguns, I reloaded the Federal Champion (paper hull) using only 5/8 ounce of #4 shot copper. I built the column up inside a Federal wad using 20 gauge shot cards and Winchester Super Grex buffer. The powder was Green Dot. This load was never found in any book or wherever, so I won't post the exact proportions. I used the larger shot for efficient kills from few hits--in other words, the rabbits weren't all shot-up. So, yep you can load very light loads in the 12 guage. Good-luck and be careful...BCB