308
I have found 308's are not too fussy re powder with a good bullet, levers and semis need fulll length sizing at the minimum (or small base as was mentioned in a previous post) for easy loading. My blr liked bullets seated as far out as i could and still fit in the mag and they were still 25 thou off the lands which is way further that i have found for best accuracy. Factory overall lengths feed in pretty well any rifle but typically wont give you best accuracy in most cases but you do need to back off loads the closer you get to the lands as pressure builds faster.
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