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Speer #14 makes that recommendation because their load data uses their own soft, swaged SWC bullets. If using cast bullets with a hardness of 18 BHN (I'm assuming that's what you meant when you wrote BRN), no such velocity limitation is necessary unless you discover your particular gun shows leading or other problems at typical jacketed velocities.
I wouldn't call H110 more violent than 2400--it has a safety limitation that 2400 doesn't have, where you don't want to download it more than 3% or 10% (depending on the source) from the max published load. H110 is a very good powder for full power .357 mag loads using mid to heavy bullets. I like it best with 158 and 180 grain bullets, but not so much with 125 and 110 grain bullets (too blasty with noise and muzzle flash).
Anywhere from 15 to 16.5 grains of H110 with your cast 158 grain SWCs should work very well, but please be sure to verify my recommendation against authoritative published data.
Mike
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