My newer (Miroku) 1892 Winchester in 44 Mag uses a 1:26 twist. I have not slugged my barrel but size to .432 with good results. Same size works for my Ruger SBH so I'm happy. I have not shot groups on paper off the bench but accuracy seems quite good and I have only shot bullet weights up to 250Gr. Paper plates, milk jugs, water bottle etc. are always in danger out to 100 yards. I don't hunt but I think the accuracy is just fine in the 100 yard range for hunting purposes. If you don't mind the $$ outlay for the Winchester it's worth a try.
By the way, it says 44 mag ONLY on the barrel but mine works perfectly with 44 Special.
Mike