Yes if the bore is .430 the gun can handle 44 russian loads as long as there regular loads not hot loaded rounds.
The only reason that other one (from another thread awhile ago) buggered up was because the guy shot a .430 bullet down alot smaller bore if the bore is .430 or even .427 then that would not have happened.
When drilling out and orignal barrel its best to unscrew the barrel if posible and make sure theres going to be enough meat where the treads are to hold the barrel in when its done.
If you can take out the barrel its better because then the liner can have a step in it to match a step drilled bore and be pressed in from the forceing cone end.
That way it can never shoot out or move forward with a step in the process.
Im not sure if the barrels are part of the frame in this F&W or the barrels thread in but on most guns the barrels just screw into the frame.
It can be done in the one piece frame and barrel its just abit harder to do.
Sadly it doesn't appear to be a screw-off bbl but I like your train of thought.
Ordered a hammer from Numrich this evening, so once that obstacle is overcame I'll build a couple of springs and look into that bbl liner.
44 Russian in this little beast would be quite a formidable combination
Thanks for the help all.
If someone is aware of a good pistol-smith who can do the liner, speak up please