My reloads were using Win primers and I had heard something to that effect, but this also occurred with two brands of factory ammo. Though i dont know what primers they use. I do plan to move to cci primers though to eliminate this from the equation.
mike- I did replace the spring, but i'll have to wait until I can get to the range to see if that fixes the problem. I think the mainspring is fine, since I know people have used #24 mainsprings without piercing the primers. I have a feeling though that the slightly stronger mainspring for was too much for the under-rated fp spring. (which was supposed to be extra power)
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