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I normally load em up pretty much like 284 does, in that cartridge length is the last thing I fiddle with. I'll use the COAL data from Lyman's 49th for that specific bullet (if that info is available) for the starting loads. If I can't get the info, then I'll measure from bolt face to lands for max length info and decide on a starting length and then vary from there.
And, like already stated, COAL is probably undervalued as an accuracy component by many folks.
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