I used a pair of 3 1/2" Navy Arms Schofields in 45 Colt for over 15 years with many thousands of rounds through them before they started to wear out. As has been said the wear line is a result of the design. On the Schofields the cylinder is locked by the trigger, not the hammer cocking. If you are used to riding the trigger you will have problems with the cylinder not turning. They do have more blow-by at the end of the cylinders. I shoot gunfighter and had to move the firing pistol in front of the other pistol so I didn't get hit in the rist with hot gasses. They are sensitive to high primers, the cylinder won't turn.
All said and done, I enjoyed shooting them and adapted to their quirks.
SR