I use them frequently with no problem in my semis. I buy the cheapest Walmart loads and have at it. Maybe I am just lucky but I have used these el cheapos for a long time. Some semis, I understand, have problems with them due to the expansion of the shell base. I haven't had that problem. Most of my semis are inertia driven, others recoil driven, a couple of gas guns.
Maybe I am just lucky.
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