I've got some .270 brass that was Winchester new and then fired once. I can't recall but I think it was in my old .270. I FL sized it, loaded up a new test batch and they wouldn't chamber. I could get the bolt forward but it would not close with moderate force, I didn't push it beyond that.
I took some pieces that I hadn't loaded yet and measured their length and they were longer than the case length shown in my Lyman manual. I went out and bought a Lee case trimmer and appropriate pilot/shell holder. I just trimmed them up and they measure 6 thousandths under the case length shown in my manual.
I tried to chamber them again (no bullet or primer) and I can now close the bolt but it takes a fair amount of pressure. Way more than factory rounds.
I sized them one more time (after trimming) and the bolt seems to close slightly easier, might be my imagination.
Any thoughts on what's going on here? Are these going to chamber easier after shooting them in the new gun? Are they un-safe?
Thanks in advance!