45 ACP barrel

tonyz · September 5, 2001, 08:44 AM

Can anyone tell me the aproximate height of the Land in a 45. OR how do you tell if a barrel is worn out? I am new to the 45 caliber!
I just aquired a P90, It look like its knew, except for the barrel which was very copper fouled.
After many many cleanings, I got most of the copper out but the differance between the lands and grove is not much. BTW The pistol shoots very accurately.

Thanks,
Tony

**4V50 Gary** · September 5, 2001, 09:53 AM

Information like that Ruger shares only with firearms examiners. The only other way to get it is to measure it.

Jim V · September 5, 2001, 10:20 AM

The difference in the land and groove diameters of a 1911 barrel is small. However, I don't have the dimensions.

James K · September 5, 2001, 12:49 PM

Standard M1911A1 barrel specs are

Land diameter .441 +/- .003
Groove diameter .449 +/-003
Rifling twist, Left, 1 turn in 16"

The lands are thus .008 smaller in diameter, which means each land is .004 high. This is pretty much a standard land height (or groove depth, which is the same thing) for jacketed bullets. For example, the .30-'06 and .308 have a bore of .300 and a groove of .308, or .004 groove depth.

HTH

Jim

clem · September 5, 2001, 10:11 PM

Tony,
If it's holding the shots in the 10 ring, don't worry about the lands & groves. When it starts to "open up" the groups, then start thinking about a new barrel.
Clem

September 5, 2001, 08:44 AM	#1
tonyz Senior Member Join Date: January 29, 2000 Location: Wa Posts: 922	45 ACP barrel Can anyone tell me the aproximate height of the Land in a 45. OR how do you tell if a barrel is worn out? I am new to the 45 caliber! I just aquired a P90, It look like its knew, except for the barrel which was very copper fouled. After many many cleanings, I got most of the copper out but the differance between the lands and grove is not much. BTW The pistol shoots very accurately. Thanks, Tony Last edited by tonyz; September 5, 2001 at 10:21 AM.

September 5, 2001, 09:53 AM	#2
4V50 Gary Staff Join Date: November 2, 1998 Location: Colorado Posts: 21,829	Information like that Ruger shares only with firearms examiners. The only other way to get it is to measure it. __________________ Vigilantibus et non dormientibus jura subveniunt. *Molon Labe!*

September 5, 2001, 10:20 AM	#3
Jim V Senior Member Join Date: January 31, 1999 Location: SE Michigan - USA Posts: 4,038	The difference in the land and groove diameters of a 1911 barrel is small. However, I don't have the dimensions. __________________ *MOLON LABE* If it ain't metal, single stack & single action, it ain't a 1911 no matter what it looks like. 1911 Forum THE TUBBY CURMUDGEON

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September 5, 2001, 12:49 PM	#4
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	Standard M1911A1 barrel specs are Land diameter .441 +/- .003 Groove diameter .449 +/-003 Rifling twist, Left, 1 turn in 16" The lands are thus .008 smaller in diameter, which means each land is .004 high. This is pretty much a standard land height (or groove depth, which is the same thing) for jacketed bullets. For example, the .30-'06 and .308 have a bore of .300 and a groove of .308, or .004 groove depth. HTH Jim

September 5, 2001, 10:11 PM	#5
clem Junior member Join Date: April 17, 2001 Location: Arizona Territory Posts: 847	Tony, If it's holding the shots in the 10 ring, don't worry about the lands & groves. When it starts to "open up" the groups, then start thinking about a new barrel. Clem