I put a Rise trigger in my AR-10, and had to put in a stiffer spring because of a light primer strike, I believe the ammo I tried at the time was some of my reloads, with CCI 200 LR primers.. Anyway, fast forward a few months, and I've been loading up some more ammo for it. LC cases, surplus 844 and 846 powder, a mild charge, 150 grain FMJ, and for primers I used some old Magtech LR primers I was wanting to use up. So far, the rifle has shot them with no issues.
In my case, I don't believe what I have is a primer problem, but a problem with putting in a trigger with a hammer spring that is a little on the light side. The support guy I talked to at Rise told me that I can go with an even heavier spring if needed, and I may change it again, just for peace of mind.
I'll add that if I could have found some of the CCI 34's, that's what I would have preferred to use.
