All three of those pistols are very likely to be Black Powder Cartridge firearms. Shooting smokeless powder loads is absolutely not safe, until you determine the exact models you have there.
Although I can tell you all about the differences between .32 Auto, .32 S&W, and .32 S&W Long; you need to find out what you've got first. You need to find out exactly what cartridge the pistols are chambered in (there are nearly a dozen .32 caliber cartridges possible), and whether they are smokeless or black powder rated.
Post in the revolver forum here, with all the information you've got. There are several H&R collectors that frequent these forums, as well as an H&R historian that does his best to provide positive IDs.
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Don't even try it. It's even worse than the internet would lead you to believe.
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