Shithot ideas folks - and no, nothing nerdy about proper analysis @Flyblown ,any chance of a copy of your spreadsheet??
Just now its hard to think beyond the 250-3000 case length, as it works so well in short actions (and of-course includes the "Crudmoor" case as its an improved 250-3000) but on pondering that a 243 or 6mm Rem on a "x57" length action is also not silly eh @nor-west
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