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Once I used the Rio primers couldn't use any other in the hulls as they had stretched the primer pocket. Now I only load Winchesters to avoid this problem. They are more expensive but I don't have the problem with primers falling out or gas blow back around the primers.
With last year's Winchester primer rebate were they not similar priced?
 
What most likely occurred was that the primer cups were pierced by the firing pins and the tiny hole on the primer that resulted allowed primer gas to blast a tiny crater into the tip of the pin.
I sure agree. One can only imagine where those tiny particles from a very hard firing pin end up. After all, they likely pierce when pressure is the highest. Those primer brands or shell brands that experiences piercing are pretty much banned from going into one of my guns.
 
I bought 100,000 back when they cost $71.00/5000. Never had a problem. Yes, they are way oversize but it doesn't matter if they are the only primer you use. I used Federal 209A data as they are a hot primer. Bought a few a couple years ago but my new gun pierced at least one of every ten. Didn't want to alter my firing pins so gave up on them.
I've shot 15K of the 209 Rio without a problem. Yes, oversized, but just use the same hulls only for the Rio. IMO, they are between the Win and Fed primers for the strength.
 
They are the largest, most oversized primers there is I believe.
Both the Rio and the Nobel Sport are sized to fit all the Euro made hulls. American made shells are made with a smaller primer pocket. As mentioned above by many posters, once you use one of these two primers. You will have to continue to do so. The american primers can and will fall out after they are used.
I used 10,000 Nobel Sport primers. These primers did damage my firing pins to some degree during this time. I shot them in both my Browning's. I will not use them again. I have heard rumors that Nobel Sport has fixed this problem. I will not try them again. Its not worth a nickel a box to me. I'm not going to play Russian Roulette with primers again. IMO you are rolling the dice if you buy these primers in large orders. They work just fine in some guns. Not so well in others. The choice is yours to make. Try loading a few hundred before you go out and buy 5000 plus of these primers. break em all Jeff
 
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