Re: My 45 auto reloads are not chambering correctly! GRrrrrr
I size to .451 for .45 ACP although that's not your current issue. (.452 is OK for most guns too though, the true test is slugging the bore)
OAL as listed is a guideline moreso than a necessity; if you're hitting rifling, it needs to go deeper in the case.
Also, did you check case lengths prior to loading at all? this cartridge headspaces off of the mouth.
"Loud noises don't end gunfights.... well placed shots do."