Thread: 6.5x47 Lapua not chambering

So was shooting 800, 900 and 1000yrs at Clevdon on Saturday and had trouble with some rounds not chambering. They are 3-4 times reloaded luckily I had some loaded up with new brass so was able to finish the day off ok. When I got home I checked the shoulder which I only bump 0.003 from fired and this wasn't the problem. 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. 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. This is not something I have ever run into before.

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. 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. 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. Any ideas anyone. Maybe some brands of die have smaller dimensions than others am using Redding dies.
Thanks