I try to stay away from the chiddite primers, just because of the primer piercing!!! Some guns have no problem while others guns pierce the primer with some regularity (within the same make and model). There seems to be no ryme or reason to this. I know that the Kreighoffs (both 32's and 80's) have a probem with them while others seem to be OK. I have had no primer piercings with the Nobel Sports, but I do find they have a hard cup cover and don't seem to dimple as deep as the Win.s I normally have used in the past. Once in a great while I will have one not go off and have to turn the shell in the chamber 180 degress and then it goes off fine. Its a small price to pay as I only have this happen once in 100 to 150 shells. Yes, it is always the bottom barrel of my Browning as well. I have not noticed any excessive wear at all on the firing pins. So bottom line is try a couple hundred before you buy alot of these primers. As long as the primer is not pierced, I don't think you are going to damage the firing pin or hurt the hammer springs. My 2 cents. Break-em all. Jeff