I have purchased several so-called "Remlins", which have proven to be excellent in appearance and function. Some have had some roughness when chambering a cartridge, which proved to be hanging on a rough edge in the stamped extractor. I removed the extractor and stoned the bottom edge to remove the burr, which solved the feeding problem. The cartridge now slips smoothly into the face of the bolt and feeds into the chamber without scraping.
Some recommend bending the extractor for a looser fit around the cartridge. i find that unnecessary after addressing the root problem, and easily overdone.
It's best to use round-nosed, flat-point bullets for smooth feeding. However with the cleanup suggested above, I can use semi-wadcutters with little difficulty. Even .38 Spl and .44 Spl feed okay, but not as reliably as magnum cases.
The original trigger has two pieces, part of safety requirement imposed by lawyers. This leaves the trigger free to flop about until the slack is taken up. This is annoying, but has no effect on accuracy. However the typical 6.5 lb trigger pull is objectionable.
I replaced the triggers with Wild West versions. There is still makeup slack, but there is a spring to eliminate the flop. The trigger pull comes down to a nice but safe 2.5 to 3.5 lbs.
.357 Magnum is very pleasant to shoot, accurate and hard hitting (1600 to 1800 fps). .44 Magnum definitely thumps your shoulder, but no more than .30-30. It does make you wonder why you can tolerate them in an handgun

. IMO, .44 Magnum is the most versatile pistol cartridge for a lever gun.
Nothing is quite as smooth as a Winchester 1873, and Uberti makes an excellent clone. They are heavy, with a receiver over 8" long, and the toggle-link action is too weak for anything more powerful than factory .357 Magnum. Their reliable feed makes them the favorite for cowboy action.