you have learnt valueable lessons....overall length is like chronicgraph measured speed......for sub 400 yard animal shooting, its not really important, unless ,like some, you want to shoot in earhole....
one of my previous .308s would chamber about 50% of resized loads only...nearly drove me bonkers trying to sort it out...in the end I poked already resized cases through an OLD 30/06 die with guts removed to squeaze sidewalls down at base in a wee tad more.....seemed to work even if it shouldnt.... have heard of some rifles needing small base dies...which sounds like they do what I fluked on... the bottom bit is smaller/skinnier by a fly poop.
take a dark coloured felt pen and colour one of you non chambering rounds...in SAFE PLACE with muzzle in SAFEST DIRECTION.... try chambering and sit there moving bolt back n forwards a bit when you find resistance.....then eject round and see where its making contact....doing that will answer a heap of questions and possibly create solution.
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