The gun was regulated by the makers when new for a specific ammunition. Unless this gun has been tampered with since then this regulation would still be valid. The catch? This ammunition is no longer available. The modern solution? Reloading. This is the only way this rifle will ever shoot again and I would exhaust every possibility to find a load that regulates before I would allow anyone to try to ‘adjust’ or ‘regulate’ the barrels to modern .470 Nitro ammo. There is loading data available for velocity and pressure equivalent loads using modern components for the cordite load and I’m reasonably confident that a satisfactory load could be worked up that regulated to a standard required for a short to moderate range elephant rifle. This rifle is a dangerous game stopper, it was never intended for precision shooting on deer. And we do have a few master gunsmiths in Canada with considerable experience on double rifles, I have very satisfactory personal experience with Ralf Martini’s work, as well as that of his former partner Martin Hagn. Google Ralf Martini, much of what you see on his website is his own work. Yes, there are a few in the US with this ability, more in Britain as well as a few in Germany and Austria and it could be sent out of country. I see this as extra complication and expense and a big risk to ending up seriously upside down financially on this project. The OP asked where he could send the gun to be restored, to what degree not specified. Not my gun, not my choice, we no longer have Nick Mackinson or Les Paul but it it was mine I’d send it to Ralf Martini for evaluation and an estimate.
Just because my opinion differs from yours please don’t treat me like I am ignorant. I know Mr Martini and Mr Hagn and their work is phenomenal!!! Some of the best work on guns that I have seen stem from their workshops and I am well aware of Mr Martini’s affiliation with Heym.
That doesn’t change the fact that there is not many of these types of guns floating around in Canada.We just don’t have the numbers.
Just because you’re a good heart surgeon it doesn’t make me want to let you take a whack at my brain with your scalpel.
I actually own a few double rifles , and reload and shoot them on a regular basis. It is not always easy to “regulate” barrels with reloading . There is numerous variables to take into account. Powder burn rate, individual barrel quirks, bullet weight, bullet shape.
You have to get two different rifle barrels with different harmonics that is soldered together to shoot parallel to each other. Yes there is a regulation range , it varies from maker to maker. 50 m is average I would say, but the ideal is to get them to shoot parallel to each other for any given distance.
A gun of that vintage can easily be out of regulation. Solder weakens over time. Barrels get shot out. Things change.
If you read my post I clearly ASKED if it is regulated ? Does the OP know?
If not it might sway his decision where he wants to send it or if he even want to spend the money.
It can be an expensive exercise. I have gone through this process before myself. Guess how many man hours it takes to regulate a double rifle? This is one of the main reasons that they are so expensive.
I am truly sorry if I offended any gunsmith that regularly works on double rifles. Like I said I am aware of Mr Martini’s prowess. His main focus however is building custom rifles …what is his current wait time?
Despite double rifles being used for large dangerous game they are still required to regulate well and be accurate . A unregulated double rifle is actually just a very expensive paperweight.
Yes they are “Stoppers” , but the goal is to prevent them becoming a “Stopper” by making a good and accurate initial shot.
If you take a weapon like that into the field against dangerous game that can stomp, trample,bite and claw you ,you put yourself, your professional hunter and your whole hunting party at risk.
My 2 cents
