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Over my 40 year reloading career I have run into many of the different problems and learned how to deal with them. Well some things you need to learn more than once evidently. I recently set out to load up a batch of hunting my loads for my 280 ai and cranked out 40 rds. My dies have good split lock rings and I never change the adjustments on the dies as I only load one load with them. I go to chamber a round and it took a ton of force to cam the bolt closed in my Kimber Montana. WTF? I try a couple more and same thing. So now I am faced with pulling 40 rds apart. The culprit was tolerance difference on the shell holder causing the case to sit lower in the die when the shell holder was touching the die. I actually ran into this years ago and try to keep shell holders and dies together as a set. Well evidently I stole the one out of this set as it is a #3 rcbs and also fits 270, 308, 6.5CM, 260 and many more. I got to measuring the distance between where the shell holders contact the ram of press and the shelf where the case sits and there was .003" difference between two examples of the same shell holder. Evidently I set the dies up a with the one with the taller step and grabbed a different one for this go round. Lesson relearned ! Keep dies and shell holders together as a set! I think I have 6 shell holders in this size to cover all the cartridges I load using them. I think I will now engrave on them to indicate which set of dies they belong to. Hopefully by self reporting my stupidity I will save someone else from suffering the same fate. It is not all bad though, I have amazon bringing me a new toy in the form of a collet type bullet puller. There was no way I was gonna kinetic pull 40 rds and mash the tips of those spendy partitions. Happy reloading.