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Message: <blockquote data-quote="Aries" data-source="post: 3734700" data-attributes="member: 44328">1. If you shoot everything in the same gun, neck sizing is probably okay and will work the brass less.  But if you use the ammo in two or more different guns, you probably need to full length resize.2.  You don't really need to trim new cases... unless you are trying for extreme accuracy and just want to make sure every case is exactly the same length.  That's generally not the reason for trimming though, it's to keep the case from getting too long from stretching as it's fired each time.  New cases won't be too long.  You may only need to trim cases after 3-4 firings, but again if you're trying for maximum accuracy you may want to trim after each firing for uniformity.  And how many fires you go between trims will probably depend on how hot your loads are.</blockquote>