I know the Baikal's have self adjusting barrels but any issues with getting double rifle to regulate when messing around with rechambering? Just whether or not a chamber can be rechambered is not the whole issue with a double rifle.

I remember the Pdersoli hammer DRs in .45/70 being rechambered to .450 No2 NE. Then saw the same rifle be sold and resold many many times. There is often a reason why a buyer sells it off again and is not stated. Let the buyer beware. The Pedersoli does have fixed barrels unlike the adjustable Baikal barrels though.

For DRs that need the barrels reregulated, if a cheap DR, and if the owner can not do it themself, it will probably cost moe than the rifle itself to do it.