Hi, jnichols2,
My old eyes are not what they once were, but that Colt doesn't look like it has enough headspace for .45 ACP and moon clips. Sure it is not a standard New Service for .45 Colt or .455?
Jim
Jim,
I'm certain it's a Model 1917. It has the "United States Property" and "US Army Model 1917", along with a US Army Serial Number on the Butt.
I'm very new to revolvers, and Google was no help on how to check headspace.
But I tried an empty shell case, several aluminum snap caps, and a live round. All slipped in smoothly, and a light showed through the spacing. The rims stayed above the cylnder surface.
Didn't try with moon clips, I have some on order.
It locked up with the empty case and snap caps, but didn't try the live round.
I don't know if those are good checks, but there does seem to be enough space ???
UPDATE
=====
I finally found the instructions for a Smith & Wesson.
The S&W spec was .006" to .012", I don't have feeler guages, so I mic'd a business card at .019".
Three of them ( .057) fit using a live round).
I don't have specs for the Colt 1917 one I ordered, but a S&W moon clip said it was .040".
I do have enough room, it may even be a little sloppy at .017". But probably not enough to cause light strikes.
I'll know for sure when I get the moon clips and pick up a set of feeler guages.