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Joined: Aug 2018
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Sidelock
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Sidelock

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I am sure I am just not getting it but if a set of barrels are properly regulated and the axis down the centers of each bore are straight, then how does cutting off an inch or two of barrel change the point of aim?

The cutting does not change the relative bore axis' (axises axees ???)

What am I missing?

Thanks

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Sidelock
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The original choke and remaining choke after the cut may affect the point of impact of one or both of the barrels, and there might be some change in how the gun is recoiling and the duration. Just thoughts.

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Sidelock
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In theory, the cut would need to be "square" to the axis of each barrel and they converge, so this is difficult. I suspect the "re regulation" would be done with files and "crowding" a reamer to one side or another.
Mike

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Sidelock
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Sidelock

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On original barrels are the ends of each barrel cut to be square with the bore axis?

I have never noticed this before. Every barrel I have with factory ends appears flat and perpendicular to the center of the rib.

Make sense that a significantly out of square barrel end would throw pattern negatively but I can't imagine an amount unnoticeable to the naked eye would make much, if any, difference.

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Sidelock
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The barrels were "square" to the axis before being joined to each other.

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Sidelock
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Anything done to change the muzzles of a double gun has the potential to change POI, thus affecting regulation. However, when both barrels are shortened their relationship to each other is not changed. That relationship, and proper choke work, is what allows regulation. Regulation does not mean the gun will shoot to POA, it just means that both barrels shoot to the same POI. POI of both barrels, together, can be adjusted to where needed.

If the barrels are shortened a reasonable amount due to muzzle damage, and most of the choke remains, and the muzzles are faced properly, I would not expect a change to regulation. But, I've messed with double guns long enough to know to not make guarantees concerning regulation after drastic surgery.

SRH


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Sidelock
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Almost makes me wish the late Burt Becker was with us, to give his insight into this question. In re-reading Jack O'Connor's Shotgun Book- the chapter on chokes- he mentions that Winchester's WS-1 and WS-2 were based on a slightly different radius that the standard Imp. Cyl., Mod. and Full Winchester chokes. My 1939 M12 28 gauge has a solid rib and is marked WS-2, but it is a field grade, not a Pigeon Grade skeet model (like my friend has-- his has the WS-1 choke markings. Any Winchester M12 addicts on the forum care to elaborate on this a bit? RWTF


"The field is the touchstone of the man"..
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Sidelock
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Sidelock

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At what distance was regulation set? Is there a standard?

Many thanks

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Sidelock
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I can't say that I can remember ever reading of a "standard" distance at which barrels were supposed to be regulated, on a shotgun. When I test double guns for regulation I like to do it at 16 to 20 yards. I want a small pattern on the plate because it is easier to determine the center of the pattern if it is small. I have found that if the gun in question is regulated at that distance I don't have to worry about it at any distance I will be shooting game or targets.

Just my findings only, SRH


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Sidelock
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Sidelock

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Thanks Stan

I cut the 30" barrels in the mismatched Lefever Nitro 12 gauge down to 27". Barrels gauged .729 all the way down from end of forcing cone to the start of chokes. I imagine I cut most if not all choke out but a a cyl/cyl 12 ga is great for what I am wanting this for.

I am using this for close in wood duck shooting. I am close to having all fitted and ready to test fire before final finishing and re-assembly.

I will start at 20Yds and see how she pattern/chokes out to 40.

Cheap gun and a leaning project for sure.

Thanks again.

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