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Old December 2, 2021, 09:29 PM   #9
44 AMP
Join Date: March 11, 2006
Location: Upper US
Posts: 25,567
You MIGHT want to consider crimping the .300 mag rounds. BUT, only if you are seeing a change in length of the rounds in the magazine after firing a round or two over them. Something you'll have to check specifically for.

USUALLY not a problem in .30 cals but IF the rounds in the mag are getting slammed about during recoil, the nose of the bullets may become a bit battered (soft points) or it may move the bullet in the case.

I crimp heavy recoiling magazine rifles (above .30 cal) as a standard precaution. Same rounds for a single shot don't get crimped.

For practical matters (and hunting accuracy) when you are not crimping, the cannelure just above or below the case mouth most likely won't make any noticeable difference.
All else being equal (and it almost never is) bigger bullets tend to work better.
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