Winchester 1885's
I have 3 of these old girls, one of which is a Winder musket. I have no complaints about accuracy. Not any at all. But then I shoot them offhand, with hand cast bullets, from my hind legs, not prone, and rarely from a bench.
Though my Zika High Wall Schuetzen in 32-40 is a masterpiece, and stands above the rest, both in terms of fit and in terms of just raw accuracy potential. Once one understands the hooked buttplate, and practices awhile with a palm rest, figures out the right shooting position, etc., the steadiness with which he can hold the rifle on target must be experienced to be appreciated.
I am impressed with the quality of manufacture of the originals. Made when quality really meant something. In my view, nothing made today compares.
I have not found that the crescent rifle buttplate on my 45-70 has been offensive in any way. Just have to learn to shoot it right. I shoot 510 grain bullets through it, with cases full of compressed black powder, and while it is no maiden's caress, it is not anything to get excited about, recoil wise, and it doesn't hurt to shoot.
While there is no substitute for an excellent barrel, I have learned through my experience with these rifles that there is more to accuracy than lock time and barrel quality. How the rifle fits me is probably more important, and I find the drop in the angle of the buttstock, and the crescent buttplate are really helpful in bringing the rifle to your face in a consistent manner, while shooting offhand.
Still have much to learn. I do not like the tendency of the modern single shots to have a straight comb, as while that is probably helpful if one is shooting prone or maybe off a bench, in actual use it requires one to position the toe of the stock in the pocket of the shoulder, and limits the fine tuning one can get by placing the stock on the ball of the shoulder, or outboard of the ball and inboard of the biceps.
So in summary, I find I shoot these rifles offhand better than what might be exhibited in raw group size fired off a bench with a bolt rifle.