I finally got my 5th Model Burnside out to the range. I have lurked here for years gaining knowledge so thanks everybody! I was shooting .562 round ball over 35 grains of FFFG with filler in plastic cases (as suggested many times here). I would put a dollop of Bore Butter on each bullet before I loaded the cartridge in the rifle. My six shot group (after about three fouling shots to find a point of impact) at 50 yards was 4" wide by 14" tall. A lot of the 4" spread is probably me even thought I was using a rest. The first shots were the lowest and the pattern progressively grew taller as I fired. I'll admit that I was testing and loaded each round at the bench using the same case over and over. My consistency in loading compression of the ball in the case may have been the problem. What else would cause this stringing up? Part of it could be me with an inconsistent sight picture. Not enough lube and the bore fouling (it didn't look bad when I was done) as I shot? Next time I will pay more attention to consistency but I was eager to get this old girl back shooting. Any ideas would be greatly appreciated.
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