Hello. Im new to reloading and Got a question. Bought Magtech primers(small rifle) and worked up a load for my Ar-15 now I have some rounds that do not fire and have no marks what so ever on the primer(including that little divit from the fireing pin slaping forward). then you recycle them through again and..... They fire. Are magtech primers junk? The depth of the primers is ok or they would not fire the second time right? Any info would be nice and appreciated. Thanks

Welcome to the forum James. No marks on the primers the first time through would be an indicator your rifle has problems. Short firing pin or weak spring. The reason I say this is if it was just hard or defective primers it would still leave an indent in the primer.
Bill

Ditto what Bill C said. I have used Magtech small rifle primers in 454Casull brass when making up a load for my 45Colt and they have been top notch. I will use Magtech primers again if and when the need and availability presents itself.

Thanks guys but I have shot the reloads through my DPMS carbine with less than 500 rounds through it and my two day old R-15 and got misfires through both. Could the brass need sized better.or maybe a small base die set to keep a large brass from slowing down the action as the round is pressed in the chamber? You guys know more than me but I trust both guns and they have been tore down twice and looked over. Am I on crack or do I hold a valid point?

with no marks on the primer the firing pin cannot have hit the primer. either the gun is at fault, or you have oversized some rounds that are sliding into the chamber to far

Something is wrong with your rifle. (Also make sure they are not small pistol primers instead of small rifle primers.)

It could be that when FL sizing the cases, you are setting the shoulders back enough to cause excessive headspace. If so, that would explain why there's no marks on the primer, as the round is getting pushed too far into the chamber so the firing pin can't hit it. The fact that there's no primer indentation should tell you that there's sopmething wrong with either the round of ammo or the rifle! NOT a primer problem, I think.