I know where brother @csmiffy is coming from..it was an issue 25-28 years ago with falcon loads..the cheddite brass loads then were different to the fiochhi brass as in the shoulders were sloped not square...its plurry hard to get photo of but will go and dig out some shotgun rounds and see if can get it...got a few different steel loads here so will see whats squarest for you..sorry havent got on to it before...hold the line caller...
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