Primers...
I think that what Cannonman is asking is something different. Obviously, you should use the correct size and type primer for the cartridge and powder you are loading.
However, the question seems to me to be, given (for example) that we are loading .38 spl cases with target loads of Win 231 pushing a 148 grain LWC, is there a difference in performance if we use Winchester Small Pistol primers, as opposed to CCI Small Pistol primers, Wolf Small Pistol primers, Magtech Small Pistol primers, or some other brand.
I use the above example specifically because IMX, there is not an observable difference on the shooting range. The POI seems to be just the same. I shoot in a league, have for years, and I use whatever primers I can get my hands on. Bullet ft/sec I have no idea of--for punching paper a steady POI is what you need.
Have had the exact same results with various brands of Large Pistol primers when loading for target shooting with the .45acp--that is, no difference in results with the various brands.
When target shooting with a pistol, there are too many other variables to consider (most being some kind of operator error) for whatever small effect the different brands of primer may have, to actually make an observable difference.
Anyhow, that is my take on the question.