I am attemping to resize 300 RUM cases with a single stage press using RCBS FL dies. The cases: Are remington factory rounds I have shot through my rifle. They have trumbled, mouths scrubbed. I lube the cases with a Dillon spray lube. But when the sizer die is set to actually resize the entire length versus the first half of the neck the case gets stuck. I tried more lube or a little less lube.... I thought it might be the die so I went and got the RCBS X-Die... same issue. What the heck did I not do or what else could be wrong?