As Stated in Post #5 these primers may not easily fit your stock plugs, But then again they may be perfect, everything is made to +- standards. If that is the case, that they are to tight, the pocket can easily be deepened if needed with a "C" size drill.
It also takes very little time to polish out the primer pocket to fit your supply of primers. If you have 1K of primers then fitting the/a plug to them just makes common sense to me.
Happy shooting,
Ken