I was at the range today and after about 3 cylinders (I was 3 pre loaded cylinders) It started to get so hard that I could hardly rotate the cyliner by had when at half-cock. Even pulling the base pin out to change thcylinders was hard. The gun was cleaned and lubed prior to loading. I had put some Bore Butter on the base pin and in the hole that it slides thru after each 5 were shot completed but it still was hard to turn. It may have been where the cylinder/barrel gap was that it was sticking. I was shooting Goex FFF.