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#3096012 - 12/26/12 10:52 AM Question about short shortening magnum barrel??
DMAG
4 Point


Registered: 11/13/10
Posts: 325
Loc: Bradley County, TN

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I have an old 7mm Magnum ADL that has been through the ringer and it needs a crown job. I know it will affect velocity, but will it affect accuracy if i shorten the barrel. I have read several conflicting reports online, but just wanted to see what you guys thought. One last thing, have any of you guys ever done your own crown job with success? Thanks for your help.

Edited by DMAG (12/26/12 10:53 AM)

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#3096029 - 12/26/12 11:10 AM Re: Question about short shortening magnum barrel?? [Re: DMAG]
TiminTN
12 Point


Registered: 06/18/00
Posts: 6340
Loc: Memphis,Tennessee U.S.A.

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I use a bronze mandrel I bought from Brownells turned slowly w/out pressure with lapping compound. It works well.
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#3096044 - 12/26/12 11:25 AM Re: Question about short shortening magnum barrel?? [Re: TiminTN]
Deer Assassin
Non-Typical


Registered: 08/01/03
Posts: 88232
Loc: Kingston Springs

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if you just took a little off less than an inch it should affect the vel that much 20-30 fps i would guess
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#3096139 - 12/26/12 12:51 PM Re: Question about short shortening magnum barrel?? [Re: Deer Assassin]
bjohnson
6 Point


Registered: 11/23/10
Posts: 618
Loc: Ft. Hood, TX / Afghanistan

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It will not affect accuracy, IF done by a good smith.
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#3096939 - 12/26/12 10:21 PM Re: Question about short shortening magnum barrel?? [Re: bjohnson]
DMAG
4 Point


Registered: 11/13/10
Posts: 325
Loc: Bradley County, TN

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Could somebody recommend me a good gunsmith in the chattanooga area
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#3097136 - 12/27/12 07:10 AM Re: Question about short shortening magnum barrel?? [Re: DMAG]
DaveB
10 Point


Registered: 09/03/08
Posts: 4707
Loc: Shelby County

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When you re-do a crown you might take off 1/4 inch, depending upon current rounded or flat muzzle. If the rifling is damaged at the muzzle, then you take off just enough to stay legal and clean up the damage.
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#3097783 - 12/27/12 03:44 PM Re: Question about short shortening magnum barrel?? [Re: DaveB]
bjohnson
6 Point


Registered: 11/23/10
Posts: 618
Loc: Ft. Hood, TX / Afghanistan

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There's a guy in Taft. Pitts Precision Rifles.
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