I prefer to roll crimp my 10's and then trim off 1/8 of an inch after firing to get an almost fresh starting point. I start off trimming 3 1/2 inch hulls to 3". (The extra 1/8 of an inch should really not raise pressures very much in a 2 7/8" chamber). I load these hulls 6 times until they are down to 2 1/4 inches, adjusting the shot cup filler accordingly, using 1 1/4 oz of #8 shot. Testing of each length of hull showed no negative effects in pattern performance or powder burn cleanliness. Of course, I do not know what effect shortening the hull has on pressures, but I keep these loads down to moderate speeds, have never had any signs of high pressure on the spent shells, and am happy to get 6 loads per hull.
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