Maybe blacken the neck with a pen to check so this can be eliminated from the options?ĭid you fire any of the problem rounds? The jump in pressure from a significant neck jam would surely be visible on the primer. Your load also seems right for around 60kPSI peak in a 25-26" barrel.Ī thick or long neck causing a jam on chambering can usually be seen as marks on the brass once extracted unfired. Maybe some brands of die have smaller dimensions than others am using Redding dies.įor the case head to have expanded to give a tight chamber fit I think the primer pocket would not be usable. This will of course bump the shoulder way more than required but I could machine the shoulder portion out of the die as well to stop that problem. I had thought of trying a body die even if I have to grind off its base to give the brass more of a squeeze. Yeah I know you are going to say over pressure loads but with a Lapua brass and Lapua 123gr Scenars 37.7gr ADI2208 at 2883fps and no loosening of the pockets I can't see that as the issue. This is not something I have ever run into before. That same new brass when fired and resized measured 0.46995 So it seems the base of the case is slowly increasing in diameter even though I have tried screwing the die to make hard contact with the shell holder and running them through. I found that the problem rounds have a measurement of 0.47035-45 at the base where as the new brass unfired was only 0.46925-35. When I got home I checked the shoulder which I only bump 0.003 from fired and this wasn't the problem. They are 3-4 times reloaded luckily I had some loaded up with new brass so was able to finish the day off ok. So was shooting 800, 9yrs at Clevdon on Saturday and had trouble with some rounds not chambering.
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