doublegunshop.com - home Forums General Discussion DoubleGun BBS @ doublegunshop.com MACHINING A SXS FOR AFTER MARKET CHOKE TUBES

gunman,

There is still a failure to communicate here. Look back at my last post and you will find nowhere in it a reference to point of aim. Again, regulation is making the two barrels shoot to the same point of IMPACT, wherever that may be. Then, as I said twice before, the gun is fitted to you to make it shoot to your point of aim. I think you're mistaking point of impact with point of aim.

There just shouldn't be this much of a language barrier here.

SRH

yo hablo englase, y usted?

Stan, I am having difficulty understanding what you mean. If I have a gun that shoots both barrels to the same place at 40 yards but it happens to be 20 feet away from where the gun is pointing is that a regulated gun? Your last post would seem to confirm this interpretation. Maybe you are adding to the language barrier.
nial

nialmac,

I may well be contributing to the language barrier. If I am, I am sorry. But, in an earlier post on this subject I said that "I can make them shoot to where I am looking if the barrels are regulated to each other, and if the required adjustments are within reason". I assumed that anyone with enough interest in this subject would read ALL posts on it, and remember them. I didn't feel the need to repeat it all again. If you take exception with my way of stating it maybe you need to ask yourself if a gun that shoots "20 feet away from where the gun is pointing" is, as I put it, within reason.

Your example is certainly UNreasonable. I have fitted shotguns to myself that did not print where I looked, and some were off considerable. But, none more than maybe 15" at 30 yards. I know you used an extreme example to make a point, but doesn't my earlier post cover what you asked?

Again, I apologize if I contributed to the language barrier. Maybe this helped to clear it up, or not?

Stan

Stan;
I certainly had no problems understanding what you were saying & concur with it.

To see if we are all playing the same game, here are my understandings of terms used.
Choke Regulation is to control the pattern the bbl/s throw.
Barrel Regulation determines where the two bbl's hit relative to one another.
Fitting determine where the bbl/s hit relative to the shooter.

Whether they are simply set to a fixture in a predetermined configuration or if they are subsequently targeted & tweaked by being melted apart & re-set ALL multi-bbl guns have some sort of "Barrel Regulation". The bbls are set to a converging configuration, not because they are smaller at the muzzle, but because the "Twist" of the gun in recoil causes them to shift their impact point in firing, otherwise they would be set parallel. This is regulation, whether they are ever re-set after initial assembly or not.

2: bingo!

I�m kind of thinking that Gunman has been hitting the sauce as of late, so take it easy on the poor old chap!!

My greatest fear when purchasing a new vintage SxS is that the barrels won't be regulated.

+1

SRH

All right, I'm going to weigh in on the "poa vs. regulation" discussion.

RP shotguns: Two barrel guns are (or should be) "regulated" (or whatever term you prefer) to shoot, more or less, to the same point at a given distance. For example, both barrels would print a pattern at more or less the same point of impact at, say, 40 yards. Different makers may use different distances, and/or may use different distances for differnt gauges. Different makers have different tolerances; I've heard that a gun was returned to Beretta with the barrels off a full foot off at 40 yards. Their reply: That's within factory specs. They can do it however they want to, and most can now assemble a gun that will shoot well without actually test firing it as the London gunmakers do. That's not to say they haven't figured it out, just that they are more thorough (and expensive) than most other makers.

As to point of aim - the barrels shoot where they shoot. "Point of Aim" (though shotguns aren't truly aimed, they are pointed) is then addressed though the stock (LOP, DAC, DAC, Cast and Pitch), and through the top rib (i.e. high at the back and low at the front will raise the POI in relation to the POA).

All these things have to work together to get the gun to "shoot where you look".

As to the original question - Briley (and other) install chokes into previously fixed choke guns all the time with no ill-effects.