Msr. Perodeau claw mounted and re-regulated a new Merkel SxS, caliber .375 H&H that I once owned.
He did so at my request, in order that it would then accept a little Leupold 2.5 power scope and so it would group well with 300 grain round nose bullets, softs and solids, at 2400 fps.
When the rifle returned, it looked as if it was made at the factory, with claw mounts in the first place and it shot about as well as anyone could expect from a double rifle by any maker.
In the event that I ever need work performed again, on any double, single shot or combination gun, he is definitely the fellow that I will ask to do the work.
He's not cheap but, nowhere near as expensive as having some mediocre person, do clumsy "work" on such a special firearm.