Reckless,
I agree with others here that, J.J. Perodeau is an expert at regulating/re-regulating doubles.
The first double rifle I ever had was a brand new Merkel SxS in .375 H&H, about 11 or 12 years ago.
The right side chamber was evidently tight because it would flatten primers with the factory ammo that the paperwork said it was regulated for (Federal 300 grain round nose in those days).
Many times said primers would even pierce and extrude a tiny flange of metal into the firing pin hole, causing the rifle to be very difficult to open.
To ad insult to injury, it did not even throw the bullets from that specific ammunition especially close together from barrel to barrel / shot to shot.
I spoke with JJ about this and then sent it to him, instead of taking any chances with whatever goober that Merkel might have sent it to / "Roll of The Dice Gunsmithing Inc." or whomever.
Not sure what the re-regulation cost me back then, because I also had him claw mount it with a straight tube (2 & 1/2 power) scope.
Parts and labor for all the above were around a thousand bucks, not counting the scope which, I already had in my toybox.
After JJ cast his magic spell over the Merkel, it never gave me another stammer or hiccough and was quite accurate as well, quite worth every penny.
I tried to find any un-solder / re-solder evidence at the barrel/rib junctions but there was none.
If I ever have to have such as that done again, I will automatically call him first.
Cheers,
Velo Dog.