10 gauge RCC brass

[Paul Harm]

From a couple of years old, an Alliant handbook shows: Rem hull, 1 1/4oz of shot, CCI209M primer, 31grs of Unique, SP-10 wad and six .135 fiber spacers has 7500psi at 1265fps. Using a Win 209 primer, all else the same had 7600psi. Go figure. Now, loading those nice looking brass shells with nitro. Man, I've never had any luck, others have. I believe it's in the crimp. My older Accurate Powder reloading handbook has a paragraph or two on the importance of the crimp, and how it effects pressure. They claim it's one of the most overlooked items when reloading. The depth of the crimp effects pressures more than the type of primer. The military had brass shotgun shells that were used during the Vietnam war. They had a rolled crimp. There was a fellow on another reloading forum that hunted with brass shells and nitro powder but he also roll crimped them. I believe the roll crimp along with the weight of the load gives the necessary resistance for the nitro powder to burn properly. I'd like to see some reloading recipes for brass shells and nitro powders, and if they're roll crimped. At one time, I was up to 30grs of PB and was only getting bloopers with glued in OS cards. This was with the Magtech drawn brass shells. I've shot many a BP shell in my doubles and only cleaned what I could see.