They're both the same toggle link action but the 73 is easier to clear jams with the removable side covers. I'd go with whatever caliber your pistols are. If you're intending to use black powder take a hard look at the bottlenecks like 44-40 and 38-40. They're much easier to clean with bp than straight walled cases are. Cheapest route would be .38 spcl.
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