Interesting. I am using Winchester large pistol primers and Longshot powder and am having no issue with ignition. I'm getting a nice clean burn (no powder un-burnt, very little powder residue in spent hull) in TOW 2 7/8" 10 ga. brass hulls w/ 1 1/4 oz. I DID initially load half a dozen that were too light and DID get a less than perfect burn, only about 900 FPS (I have a chrony that reads reliably shotshells). You could tell they were a bit lame when fired.
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