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I would opt for the '73 over either the Henry or '66. In addition to the improvements mentioned for the '66, the '73 is the only one of the three with a lever safety to prevent firing out of battery. Also the action side plate removal is much improved on the '73 making stripping for a thorough cleaning much easier. This is particularly important when using black powder.
Also, if you might ever contemplate the use of black powder, the .44-40 case design lets much less powder fouling blow back into the action than straight cases like the .45 Colt.
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While I agree in principle with the above in that I enjoyed my 73 so much I thought I was set up for good, however, when I scratched the itch for a Yellowboy, I found that it had it's own unique attraction. Now I get a kick out of shooting both of them as well as my 2 Rossi 357mags; a 24" rifle I with tang and globe sights I use for up to 300yd shooting and a 20" carbine that is light, fast, and compact to take woods walking.
I thought long and hard about which caliber I wanted for my '73, 45 colt vs 44-40. For me, black powder is just too messy and too much trouble to handload to consider. (I have a Dillon 650 w/casefeeder and black powder is definitely NOT a good idea with it.) I understand that the 44-40 is an original caliber and that the thinner walled brass allows for a better case seal when fired.
I also could get the companion Uberti SA Army I have in 44-40 too instead of the 45 colt I got. It's just that the 45 colt sort of called to me as a fun caliber in that down the road, I could pick up a Rossi rifle to allow me to load up full power 45 colt loads to provide some real 'smack down' power should I decide to go for some hog hunting some day. In addition, the larger bore means that the big, heavy 24" barreled '73 weighs less with a .45 caliber hole down it vs the .429 caliber hole of the 44-40.