i know exactly what it could be, or at least a couple things could be going on. i did the same crap :roll: did you partial size the brass with a full length sizer? or maybe neck size? if so, you'll need to adjust a full length size die down to barely bump the shoulders back some. the cases are too long from head to shoulder(too much headspace). the hammer will not cock on a encore if the barrel is not fully locked up. the long case is keeping it from doing so. another possibility, do you lube inside your case necks? if not, that will stretch the neck back out some when you drag the expander back thru the neck, while sizing.
go to an auto parts store and ask for some plasti-gage(really cheap). take a stick of it, place it between the barrel and frame, close the action carefully, reopen the action, then measure the squeezed thickness of the plastigage with dial calipers. this will give you the barrel to frame gap. remove the barrel from the frame, push a fired case into the chamber. carefully measure how much of the case protrudes from the chamber end of the barrel. you can do that by eyeballing, and feeling with your fingernail to compare with a comparable thickness feeler gage blade. it's kinnda tricky. it's hard to guess a few thousandths, but i have done it. i decided to get a bellm headspace indicator for $30 to make it easier.
now, adjust your sizer die down until a fired resized case only protrudes .001" or so less than the previously measured barrel to frame gap. you can keep relubing the case and resizing while adjusting the die down in small increments to get headspace correct.
hope this helps, and is not too confusing.
how many firings on those brass? my 6tcu did this in my contender after 3-4 firings without bumping the shoulders back. the result in a contender is a misfire. the encore just will not cock at all. after bumping the 6tcu shoulders back, misfires went away immediately. i also had the same thing happen in my 6br encore. after bumping the shoulders back, no more hammers not cocking. you have to be careful not to bump them back too far also. never let the case head go below flush with the chamber end of the removed barrel. use the barrel as a gage to setup your dies. :music: :money: :money:
