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Old 09-02-2004, 03:15 PM   #1
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counter bore barrel

I've seen it on various rifles. I do not own one. I'm thinking about one.
What's the scoop? How do these rifles shoot? How is their accuracy?
Please give me details.

Thanks,

Bill
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Old 09-02-2004, 05:06 PM   #2
JR
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Counterboring is usually to restore the accuracy of a rifle who's muzzle has sustained some sort of damage, like over-eager cleaning with a steel rod. The rifling is damaged at the muzzle. The counterbore removes the rifling back to the undamaged part, and gives what is essentially a new crown inside the bore. Usually you needn't go back more than a few eighths of an inch.

I have a restored Inland M1 Carbine that was counterbored 3/8", and it is superbly accurate for a carbine.
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Old 09-02-2004, 06:23 PM   #3
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It has the effect of shortening the barrel. It can be done well or badly, in which case, it will either improve the accuracy or it will worsen it. It usually does the former.
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Old 09-02-2004, 07:27 PM   #4
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I understand what a counter bore is and how it works, what I am interested in finding out is the effect that it has on accuracy and bullet flight. I don't expect MOA, but I want to what is a reasonable expectation for the performancewith this modification.

velcro
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Old 09-02-2004, 09:54 PM   #5
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It depends on the condition of the throat and bore. Assuming the barrel was new, and only the crown were damaged, it would bring the barrel back into new condition. There are too many variables to say precisely how it will shoot. In any case, it should bring the rifle back to within arsenal specifications. Which country built and refurb'd the rifle will have some bearing on that. Some had more stringent accuracy specs than others.
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Old 09-06-2004, 07:48 AM   #6
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My 91/30 sniper rifle has been counterbored and it will shoot 4" at 200 meters. Like mentioned above it depends on the rest of the rifle and the ammo used. I would buy one again if I liked the rifle.
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Old 09-07-2004, 07:28 AM   #7
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I have a 1941 BNZ K98 Mauser that I need to get the barrel counterbored. Can anyone suggest a gunsmith in the LA-MS area that can do this for me?
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