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Well you learn something everyday!
I just bought some once fired 378 WBY brass on e-bay. I FLR sized them and they still gave me one hell of a hard time chambering in my 378 WBY Mag.. I resized them again screwing the die down where it actually torqued the press when resized still the same!
Man this sux!
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Before you spend money, find out where the problem is - it is fairly common for fired cases (belted or not) to not fit a new gun after being full length sized... because sizing dies do vary and so do chambers.
After FL sizing, when you chambered a case, did it go in smoothly, and them get tough just before closing - if so, it's the length to the shoulder that's too long (aka headspace).
If it got tougher as you pushed the bolt forwards, then the body dia is larger then the chamber.
Before spending money on a new die that might not solve the problem, find out - you might take a "Sharpie" pen and blacken the FL sized case all over, and then chamber it a few times, and see when the ink is being pushed off. Then get the tool that you need.
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Well like goodgrouper said (more or less) RCBS SUX!
I bought a set of Forster dies in 378. FLR'ed the brass and they chamber like butter.
FLR'ed the rest (once fired in another 378) with the RCBS die and again would not chamber. FLR'ed them again with the Forster dies and voila!!!! Like virgin brass feeding!
NO more RC..BS for me. /ubbthreads/images/graemlins/confused.gif