monkeywrench Posted July 6, 2007 Share Posted July 6, 2007 I went shooting today and shot some hand loads. It got hot. 100 degrees. I was not shooting hot loads but I noticed pierced primers. Shooting AR15. Fairly new rifle. Less than 500 rounds thru it. First batch was 5 rounds of: win brass (new) WSR primer 24.0 gr. H335 55 gr. SFMJ/BT = one pierced primer Other loads were some 1X L.C. brass 20 rounds: WSR primer 24.7 TAC Hornady 55 FMJ/WC = three pierced primers. Now I have to buy a new firing pin. What gives? How much do you reduce military brass powder capacity? Do you reduce from the starting load? Link to comment Share on other sites More sharing options...
BritinUSA Posted July 6, 2007 Share Posted July 6, 2007 I had the same problem but with a handgun with a lightened firing pin, went back to the factory firing pin and the problem went away. I was getting flattened primers too, that problem also disappeared with a factory firing pin. So it may not be a load problem but I would run the rounds over a chrono just to be sure. Link to comment Share on other sites More sharing options...
TonyT Posted July 12, 2007 Share Posted July 12, 2007 Pierced primers are a classic sign of excessive pressure. Another possibility is a overly long firing pin. Link to comment Share on other sites More sharing options...
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