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

regarding regulation of sxs shotguns.... old ed has done some sleeving in the past as well. i had him sleeve a parker dhe a few years ago. he asked me how i wanted it regulated? i answered, what do you mean? his response was, at what distance do you want the shot patterns to converge. my response was what do you mean? he sighed and looked up at the sky and then back at me and responded: usually when i sleeve a gun, i regulate the new barrels to converge the shot patterns at 40 yards. my response: sounds ok to me! anyway, he sleeved the gun and the new owner patterned it at 40 yards. guess what, it shoots to point aim with both patterns one on top of the other at 40 yards....

I guess that was a great engineering feat? Exactly how much differently patterning was it than a factory Parker? The barrels were somehow differently configured at the front or back ends?

If you do the trig, you'll find that in order to move the pattern any significant amount, you either have to change the barrel configuration drastically, such that the barrels look a lot different or egg out the chokes. If the original barrels patterned well on a production gun, new tubes stuck in the breach end and soldered all back together is almost always going to result in the same outcome, if the work is any good.

gunman,

I don't know where you got the idea that shotguns aren't regulated, but they are, or at least they should be. Not to the extent that double rifles are, certainly, but regulated nonetheless. What regulation means, in regards to a shotgun, is that both barrels put their respective patterns to the same point of impact at a certain distance from the gun. Getting the gun to shoot to point of aim, or where you are looking, then becomes a matter of fitting the gun to you to make it do so.

I will not tolerate a shotgun that does not print both barrels within 2" of the same place. I can live with 2", but no more. I recently was given a new .410 double built in Turkey. First thing I did was pattern it. Right barrel prints to point of aim, but left barrel prints 4" right. This at 25 yards. This WILL be corrected, or the gun will move on.

Your ideas about barrel joining lead me to believe that, if you did indeed build guns, you must've been a stocker, checkerer or engraver. I certainly wouldn't want a gun you had joined the barrels on.

SRH

chuck: what do you mean?

I think you guys are being a little rough on Gunman. It is hard to explain gunmaking in a paragraph. Ask questions instead of being so critical.

Stan,

Do you know how the Turkish gun patterns at 40 yards? Is it possible the divergence would change at that distance?

Well, first I soak the ribs in a brine solution overnight. Then I marinate them in a tomato-based barbecue sauce overnight. Then, over a hot charcoal fire, I give them about five minutes per side. Melt in your mouth delicious!

Oh, I see I see you must have been referring to two pieces of steel brazed together! Sorry.

Don't sauce your ribs until the last 20 minutes of the cook. It keeps the sugar from carmelizing so they don't look and taste like burnt offerings. Red Green would just duct tape that shotgun's barrel rib in two places. If the women don't find you handsome they should find you handy.

Haven't patterned it at 40 yards yet, builder. I am going to do more testing before I start removing metal, but strongly suspect the left barrel to be too far right. In fact, the way it's looking, it will be further off at 40 than at 25 yards.

Rendezvous Restaurant's Dry Rub is the ticket for great ribs!

SRH

They say you can always tell an American, but you cant tell him much.

Seeems the old experssion is true.
In order, Eightbore, as part of a team I worked on guns that were built for Holland &Holland.Dickson,Churchill,Westley,Cogswell& Harrison, Bland,Linsley,Chubb Webley & Scott, Greener and few others.Since then I have rebuilt barrels for many major companies both in the UK and the US, without any complaint.

Piper, the parallel in question is the parallel of the bores on the hoizontal plain or vertical in case of an OU. So as when you look down the barrel one is not higher than the other. As a self proclaimed engineer I would have thought that was obvious to you.

Stan, you are talking drivel and you obviously have no idea about gun making . When you have been in the trade for 20 years come and talk to me again.

Work it out ,subtact the distance between centers of a SxS at the muzzel from the distance between centers at the breech , devide this by the length of the barrel in inches to get the taper. From this you can calculate where the center of the bore line should be at any given distance ,.You can then apply the same priceple to the hight of the ribs above the bore centerline to give the same.
When you have done this you will see that to build a pair of SxS barrels that will give an exact overlapping pattern ay 30 yards you will need the barrels spaced about 5/16" at the muzzel and the rib at the muzzel would need to stand above the barrel about the same. How many of you have guns like this ?????

ED sorry if this has got a bit heavy and off topic .