I have a pair of 45LC R&D cylinders for my 58 Remingtons. At first, no problem at all. But, at the last shoot I was at, the Firing Pin Plate would not fit right up against the cylinder with the ammo loaded. Had about a 1/64" gap between the plate and cylinder with ammo loaded. This made it difficult to load the cylinder back into the gun. BTW, these are Pietta Remington's.
Of course, after I finally get 'em back into the gun with a little strain of the muscle, they would still fire as usual. I also noticed that the new bulletts would sometimes not drop right in and had to be encouraged a bit. Not sure if their seating all the way up into the shoulder, (could be some of the Winchester bullets are "shoved" too far into the casing causing the casing to swell up just a mite too big
). Tried swapping cylinder and guns around with no change in the problem. (Even swapping firing pin plates around on cylinders, too)
The ammo I'm using is factory loaded Winchester 45LC Cowboy. These are your standard 45LC.
Any thoughts or help would be greatly appreciated.