I have used 2400 and IMR 4227 for .30 Carbine with no problems, but H110 is close to the GI propellant originally used and is probably best. WW297 is essentially identical to H110. You can't get enough IMR 4227 (or H 4227) in the case to get a MV over about 1750 ft/sec, but otherwise such loads function OK. At least you don't have to worry about overloads.

I also have a Ruger Blackhawk in .30 Carbine. I do not like to shoot it with GI or GI-equivalent loads - too much noise and muzzle blast to suit me. I normally load ammunition for it to approximate .32-20 levels.