I agree--WW-296/H-110 is a one-trick pony. Hercules/Alliant 2400 is far more flexible and tractable, and I use 8# of 2400 to every 1# of 296/110.
The 30 U.S. Carbine's ballistic environment was the platform that WC-820 spherical powders were designed operate in. WW-296 and H-110 are commercialized derivatives of the original WC-820 'recipe', if you will. Those of us who dabbled in the milsurp powder alchemies during the 1990s found some variances in lots of all of these fuels, and suppliers in 'GI Brass' copped to these realities. 'Fast lot' and 'Slow lot' flavors were listed and sold.
I am a fan of the 32/20 WCF and its close cousin the 30 M1 Carbine--which is for all intents and purposes a rimless 32/20 WCF--at first blush.
Not quite, though. The 30 U.S. Carbine as-issued has never had the rep for being a tackdriver in terms of dowrange accuracy. I had a Marlin Model 62 levergun for a time, and it had similar accuracy to my Marlin 94-series leverguns with jacketed and cast bullets--about 2.0 to 2.5 MOA from 50-150 yards. These results are significantly better than any I have seen from the gas guns/carbines chambered in 30 U.S, Carbines. I've wondered just how accurate fixture-fired 30 USC cartridges could be given close dimensions and and good components, or the same ammo quality in a bolt rifle with good specs. My work with the 30 Carbine Blackhawks hints at some intrinsic accuracy potential for the cartridge, whether the fuel is 2400 or 296/110, jacketed or cast. Good bullets and proper priming produce nice outcomes.
The 32/20 is a lot crankier. It behaves well when fed 2400, but will NOT do well given like/similar pressure levels of 296/110 (100-118 grain bullets run at 1700-1800 FPS, cast or jacketed). Like the late Ken Waters once wrote--'The 32/20 WCF is just an enigma--especially in a handgun.'