Heck no...uniform the neck and go.
If you had a "close" chamber you'd have had fun chambering some new Starline 308s I loaded recently.
I ran into this once, only with loaded factory rounds. I have an old custom mauser stamped, ".257 REM" that's a Roberts. It wouldn't chamber 117 grain Remington factory loads. I was fairly panicked. New Remington brass worked fine, however, and even shoots well.
Thankfully, I've not run into it again. I guess they're all a sample of, "1".
FC
