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The magazine from an H&R .32 autoloader will fit in a colt 1903. The reverse is not true, however, because the H&R magazine has a hole where the magazine release fits.
Since it went all necro...
Got a link to either the H&R gun or the mag? If they're affordable, I'd love to buy and try one in my 1903.
If you don't find that one, I've actually had good luck with a Triple K magazine in my 1903. It runs just as well as my original Colt mag.
Good luck with a triple K?! Well theres a first time for everything, i guess...
HTRN, I would tell you that you are an evil fucker, but you probably get that a lot ~ Netpackrat
Describing what HTRN does as "antics" is like describing the wreck of the Titanic as "a minor boating incident" ~ First Shirt