Any current American commercial ammunition or equivalent handloads will be fine. The ammo companies stopped loading two kinds years ago.
Further, the whole "rifle" and "revolver" thing was misunderstood. At first there was only one load and it worked fine in both Colt and S&W revolvers, and in various rifles. But then came the cheap Spanish revolvers chambered for .32-20 because it was close to the French 8mm Lebel for which WWI revolvers had been made.
Those guns blew up with some regularity, so the ammo companies reduced the pressure of some of their ammo and labeled it for revolvers, even though quality revolvers had had no problems.
Jim