had similar issue with .308 win in the BLR.... strange ,but I found by running the brass through OLD Lyman .30/06 dies it shrunk the web area somewhat and pretty much solved my tight chambering issues.... buggered if I can work out whats causing yours.... MAYBE get one of the tight cases you happy to chuck away and agressively trim length off neck step by step and SEE if it changes things...you loose ONE case but eliminate possibility they are causing issues by being too long in neck area...
sounds like Mr Songhurst might have answer for you.
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