RCBS .40/10mm dies I noticed that my jacketed loads, 135 Nosler and 155 Hornadys (old style H.P. not XTPs) are experiencing 10-20/1000 setback after chambering. I had worked up some mild 155s and they seemed much hotter then I expected which lead me to double check this. Gun is Dan Wesson CBOB with a 22# recoil spring and when chambering the bullet does seem to hit the frame ramp vigorously. Nosler 135s are 3 times loaded Remington brass colored brass Hornady 155s are 1 time loaded Starline, both nickel and brass. I tried cycling some factory loads and some .401 cast loads I have and they appear fine, and only setback a 1/1000 or two, with the exception of some 200 grain Blazer which setback 10/1000 on one round, one did and one didnt setback at all. The RCBS die set has 91 stamped on the die, Im assuming 1991 which would be about the time I purchased them. Sizer ID is .417 Expander is .397 Inside Case ID after sizing is .397-.398 I searched all over the internet, and what Im finding is this is somewhat common, what with the .40 guys seeming to notice it more, no doubt because there are more of them. Recommendations have been EGW U dies and/or Lee Dies, EGW U dies are made by Lee? My understanding is that they are sized to make the case 1/1000 smaller. Im convinced its not a crimp issue due to what I learned in my research and the fact that I adjusted my crimp from .422-.416 in an attempt fix it, which of course didnt work. I just got off the phone with RCBS, they said to mail in the sizer with 5 fired cases and said theyd look at it. They also had me try to insert a bullet into a sized only case, and it wouldnt go. Have any of you guys experienced this? Solution?