Dog, per all I have gathered and read, with any of the S&W 45 acp's, it's a **** shoot. I can with my newer 625 PC, but I can find you a metric ton of posts about folks who cannot. In my Aug. 2008 Handloader magazine on the 45AR, Brian Pearce, the author, noted conversations with S&W where the company made the decision to move away from this ability, by design.

If you can inspect a potential purchase, you could check the headspace between the back of a moon clipped reload and individual chambers with loose ammo/cases to perhaps make an educated guess. Then there is the issue of the oal of the brass. If it were me, I would bring a clip of sized cases, a handful of sized unclipped cases, a few auto rim cases and your feeler guages. I would think any LGS would allow this, as this would not be ammo.

Craig