Primers- How Interchangeable are they?

[Tipsymutt]

Hi guys. I’m sorry if this is a dumb question, but here goes: How interchangeable are primers? Does it matter as long as they are the right size? I have been reloading for a while now, but have always stuck to published data. Unfortunately, in the current world in which we live, reloading components are often hard to find (not to mention expensive). I have the “ 6.5 Grendel Reloading Handbook” volumes one and two, as well as data from AA, but many of the loads spec different primers. I currently have on hand CCI 450’s, but some of the bullets and powder combinations that are listed are for Remington 7.5, Wolf, or other primers. To further confuse things (or me) some reloading data doesn’t even specify a primer.
So, I guess what I’m asking is; can I use my CCI 450 primers in a recipe that calls for a Rem 7.5 of Wolf, or any other, or could this cause bad pressure issues?

Thanks!