The thread on loading brass hulls got me thinking about the pressure variables when loading plastic hulls with BP. Most manuals have disclaimers warning reloaders not to mix and match various components and I have read that different hulls and primers are two of the variables that can increase or decrease pressure.
My load for most of my BP SxS is 1 1/8 shot with equivalent volume of shot. My hulls are 3.5 inch Kent cut to 2.5 inches and skived. Primers are Win 209. I put in the powder, 1/4" dry wad, 1/4 lubed wad, plastic shot cup with the compression component cut off, compressed with the powder tube of a Mec 600, shot, over shot card then rolled crimp. If I started to changed the type of hull and primer what pressure increases might I expect?
