FWIW
couple of seasons back I had some issues blanking primers (FGM) due to a firing pin hole that needed bushing.It was spoiling my day (first 2 relays 5 pierced primers!).6PPC TN 68 g Eubers VV 133
One of the more experienced fellows gave me some WSR primers (harder cup) and told me they would work with VV133 just as well.
Didn't believe him till I used them next relay and -1.No more pieced primers and- 2. absolutely NO Change in accuracy or even point of impact.
I found it hard to believe but for the rest of the summer I ran WSR primers at almost half the cost of FGM's.
I know certain powder/case combinations require CCI or FGM for best performance ...but vv133 and wsr's worked!!!
Give it a try if you're up to some experimenting.
Gord