Well, I got my cylinder in from VT. Now I can say I have an 1875 with both cylinders. Woo-Hoo for me I guess... I was expecting to be able to shoot with .45AR loads, but that weren't meant to be. The distance between the cylinder face and the shroud is too short, or the distance between the shoulder and the cylinder face is too long. Of course I shoulda known that the .45ACP would headspace on the rim and that they would not have left space consideration for a moon clip in a SA (duh). Anyway, the AR ctg's rims are too thick to allow for rotation.
I only tried Winchester WB ACP loads in the ACP cylinder and the results left much to be desired- 6" + at 10yds! Now the .45Colt cylinder and reloads were amazing! The 1875 handled well, shot to point of aim between 10 and 18yds, all cases ejected well with no stickies or need to exert a lot of pressure on the ejector rod, and the trigger stayed wonderfully light and consistant. I have no idea why I didn't get one of these things years ago!