You might try googling (or binging or whatever) "H&R Automatic Ejecting 38 S&W Caliber" as these were known, and you'll get some hits on an appropriate forum. All I know is that if it has the caliber marked on the side of the barrel it should be safe for modern .38 S&W ammo if mechanically sound otherwise. I've got an older 1890's vintage H&R which is a black powder gun.
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