I've been loading H-110/W296 for 357 and 44 mag since 1985. This propellant is a one-trick pony. You load it up good and stout and it delivers very clean, consistent, high velocity ammo. If you don't load it up good n stout, this happens:
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it is observed that ignition and burn become erratic.
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This is especially true with 357 Magnum (I only load 158's). I have gotten away with some slight downloading with 240 grain 44 Mag ammo. I have no experience with 454 Casull. But as 44 AMP also stated, I would recommend this:
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If you want something less than H110's listed starting load performance, simply use a different powder, one better suited to the performance range you want.
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This is why I like 2400 quite a bit these days. Not only is it a bit faster than H-110/W296 to begin with, it also lends itself to being de-tuned and still run consistently. If you want to de-tune even further, I'd recommend Power Pistol.