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Politics : PRESIDENT GEORGE W. BUSH -- Ignore unavailable to you. Want to Upgrade?

To: J_F_Shepard who wrote (307973)	10/13/2002 4:06:35 PM
From: DavesM	Read Replies (2) \| Respond to of 769670

I believe that the objective of lapping is to make a barrel more accurate.

To: J_F_Shepard who wrote (307973)	10/13/2002 5:54:35 PM
From: Ish	Read Replies (1) \| Respond to of 769670

<<Forensic scientists can read a partial or altered fingerprint and confirm identity of a human, I see no reason why partial rifling would not also identify a gun in the great majority of cases.>> You're talking about very shallow scratches in the bullet, the land and groove marks will vary little between barrels of the same make. Lets say you had a scratch pattern- lll lll lll lll and some of the rough spots smoothed out l l lll l l lll was what was left. 2 of the patterns are still there but 2 are different. No match. <<Wouldn't that affect the accuracy?>> Lapping is done to improve accuracy. <<Aren't most bullets lead???>> Lead cores, copper jackets, steel in the cores and tips on the good ammo. <<And wouldn't that require an awful lot of work for the average criminal? >> I can do it and I've been called dumb as a post on this thread. It requires about $20 in materials and a camp stove. 10 minutes work after the lead melts. <<I also doubt that shortening the barrel by 1/4 inch would significantly alter the markings to defy an expert ballistics guy.>> Well you're a lot smarter than I am on that. I only have 8 rifles, one of which I built. <<How many rounds wear out a military rifle....???? An M-16 for instance?>> The .223 Remington they shoot isn't a hot load. I'd say they would start losing accuracy around 5,000 rounds. I don't know at what point the unit armorer, the guy who fixes the weapons, would change a barrel as they aren't supposed to be that accurate to start with. The barrel was designed with too tight of a twist to be really accurate.