Yeah they are a fairly hard primer @Toby they used to make primers for PMC which I used to use exclusively in my bolt actions (308 and 6.5x55 CG) when I snaffled up a couple of thousand of them for cheap as at the time I was having issues with FTF's using CCI LR primers and the murom/PMC ones I was getting no FTF's. Dunno what murom primers are like these days as it has been a while since i used them under the PMC label but I know one or two forum members had FTF's in their semis while using them maybe they could make a comment on it. I do not know if any other manufacturers make primers exclusively for semis.
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