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Measuring muzzle wear without gauge

Printed From: The Carbine Collector's Club
Category: The Club
Forum Name: General Discussion
Forum Description: Carbine Related
URL: http://www.uscarbinecal30.com/forum/forum_posts.asp?TID=4967
Printed Date: Mar 29 2024 at 6:09am
Software Version: Web Wiz Forums 12.01 - http://www.webwizforums.com


Topic: Measuring muzzle wear without gauge
Posted By: ABNAKS
Subject: Measuring muzzle wear without gauge
Date Posted: Oct 16 2020 at 9:44pm
I bought a Postal Meter Carbine in excellent condition that I haven't shot yet. Has an IBM barrel (no date mark on the barrel, which apparently was not uncommon). I don't have a muzzle wear gauge so I used the field expedient 30.06 cartridge method. I used a WWII box of LC "M2 Alternative" to measure. Gap between the case mouth and muzzle was between .11"-.12", which should put it roughly a tad under 1/8". That would be (according to some formulas I've seen online) around a 2+ muzzle wear measurement. Sound about right? If that is correct it should still have some mileage left on it, correct?



Also, I tried a Federal new-production 30.06 150gr FMJ for the measurement and it was way lower than .011". You're supposed to use actual M2 if my memory serves. The M2 I used was "M2 Alternative" (whatever that means) so would that affect the validity of the estimate for muzzle wear? I know not using a real-deal gauge makes it an ballpark figure but what do you guys think?

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11C2P Airborne Infantry
83-87



Replies:
Posted By: W5USMC
Date Posted: Oct 17 2020 at 12:09am
Would imagine your carbine barrel still has a long life remaining. As far as the M2 Alternative ammo goes, the "alternative" has something to with the make up of the lead core (different ratio of metals used). The actual bullet shape (ogive) should still be the same as the regular M2 round. Shoot it and enjoy and buy more!

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Wayne
USMC Retired
NRA Life Member



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