I have a excellent condition 44, both the rifle and bore, in 32/40. It was my first SS in '85 and I still have it. I haven't shot it a lot but, I did chronograph Harvey Donaldson's favorite 32/40 load in it. That load is 20 gr by volume of 4759 or 12.2 gr by weight. BSed it was 1244 fps and ex spread, 17 fps, with the 319273, Hudson bullet. Sights where flip up Lyman tang and factory post, 6'oclock hold. 1" @ 100 5 shot group. Harvey said in his "Yours Truly" book, that he could shoot a 1" group in 32/40, anytime! It is a good safe load for a 44. I've also shot 3.5 gr 4759 and 35 gr F, BS, with both the 319273 & 319289. The accuracy wasn't as good and it was higher pressure, most likely, because it was 1460 fps but, seemed to be safe. On my 44/45, that was originally a 32/40 with the hammer block, I built my wife a 32/20 and used a 184 gr bullet, BS. That load was 8.0 gr Enforcer @ 1248 fps. It was a bit to much for the 44, as it stretch case heads and would separate them in 3 - 10 shots. Remington's lasted longer than Win. I then built a 32/20 on a HW action and she never separated or stretched a Rem case. My point here is that the cases will tell you when to stop, on the hammer block frames, at least. I think the 25/20SS is the best to use, as opposed to the 25/20R Win for a 44, based on the smaller case head and thus less bolt thrust and watch for any case stretching and I think you will be good.
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