When loading some brass 12 bore hulls last week I noticed that my wad stack and over shot cards did not seat properly. I load these with black powder and shot them today to check function. They worked fine but I think it's time to resize them. I was looking at the RCBS "Cowboy" set and would ask if anyone has experience with them. I picked up a gunsmith brass size die years ago at a gun show in the junk box at a table and it works well. Lube the hulls and tap into and out of the die. I use a rawhide hammer and a wood dowel relieved for the primer seat. How do the RCBS dies work for this task? I will partially anneal them before the next reload. These are Remington and Winchester hulls that had been used when I bought them years ago and I must have at least 40 reloads on them. I do not roll crimp so have had no mouth splits but a very few have finally showed hull splits and those are culled out and retired to the hull collection or cut down for powder and shot scoops. I hope a partial anneal will put a little spring back in them. I still have 4 25 round boxes of new Remington "Best" No.12 hulls in reserve.