Re: Primer vs. Powder
I think many people put too muck relavance into the primer, when it is mostly the bullet and powder that make the show happen. I've fired primers onto paper with a short barreled pistol, and the biggest difference was the amount of stuff they deposited on the paper. Fed 210 and Wlr were by far the best as far as clean, with the others worse to varying degrees. This was years ago, and CCi and Rem may have cleaned up their act, but they were rather dirty at the time.
Another thing as to primer choice is how well chemically a primer reacts to a powder. I've had trouble with Magpro and 215's, and when I called Sierra on another topic the Tech. (Rich-I believe-it's been a couple of years) said to go to Wlr with the Accurate ball type powders, as the Fed primers don't oxidize well with some powders.
T3oleman is right, the gun will let you know if all is well.