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1/25/2018 7:38:29 AM
Posted: 10/18/2003 1:40:29 AM EST
Searched first, but didn't find my answer.

I've got a Colt Sporter (never fired) and a case of surplus ammo. I intend to Break-in and site-in my barrel with some quality ammo, but after break-in, will I damage my barrel if I shoot the surplus through it? Thanks - Rick
Link Posted: 10/18/2003 1:53:10 AM EST
Is your barrel chambered for 5.56mm or .223? Hoppy
Link Posted: 10/18/2003 2:18:29 AM EST
[Last Edit: 10/18/2003 2:26:18 AM EST by RickDel]
Hoppy, .223 I may be using the term "surplus" wrong. When I said surplus I meant inexpensive/cheap. My ammo is Union Metallic Cartridge Co. (UMC) L223R3 55 Grain Metal Case. It shipped boxed not loose.
Link Posted: 10/18/2003 2:42:53 AM EST
[Last Edit: 10/18/2003 3:01:31 AM EST by JoeInCT]
By "barrel damage", I am assuming you are referring to excessive wear. Industry standard 4140 or better barrel steel will stand up well to thousands of rounds of brass-jacketed bullets, since brass is softer than heat-treated steel. Only concern I have ever seen raised was for steel-jacketed bullets with only a thin copper or brass "wash", such as with some Russian or former Com Bloc ammos. I guess the concern is that if the "wash" is too thin, the barrel lands will dig through the wash and into the underlying steel of the jacket, resulting in barrel wear in excess of what would be caused by an equivalent number of brass-jacketed rounds. The UMC ammo you have will be fine. My son and I broke in our ARs using UMC. It's not mil-spec in terms of powder load, but good commercial .223 ammo. Remington's UMC line concentrates on FMJ bullets in military-favorite calibers, and I have never had any problems with their ammo (.30 carbine (M1 Carbine), 30-06 (M1 Garand and 1903 Springfield), and .308 Win (M1A and M14)).
Link Posted: 10/18/2003 2:58:51 AM EST
Joe, Thanks for the thorough repley. And I'm glad to hear I don't need any other ammo for barrel break-in.
Link Posted: 10/18/2003 10:33:07 AM EST
Unless you intend to compete, I wouldn't worry about the "bi-metal" jackets that are out there. They will wear your barrel out faster, but not enough that you would ever notice.
Link Posted: 10/18/2003 10:35:19 AM EST
Link Posted: 10/18/2003 4:10:43 PM EST
Troy.....is that a rule of thumb for all USGI chrome lined barrels? such as on a M1A...300+rds? LONGHUNTER
Link Posted: 10/18/2003 6:17:58 PM EST
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