I'm going through a bunch of stuff the I inherited from Machine gun Bill and came across these vintage 45 rounds on a clip. What gun were these made to charge?
The base of the 45 ACP is the same as the base of a 30-06 or 308, .473 in. So those could have been left over from some one just sticking them in the clip.
Doing the Occam's Razor thing, I'd say that a field expedient for storing loose .45 rounds is more likely than stripper clips for the .45 Broomhandle, as those were "locally produced" in China, I believe, as opposed to being a "real" model.
Just my opinion.
ETA: also, the cartridges themselves seem to vary, as opposed to this being a factory-filled clip.