Mark
As Mike said, H-110/296, which are identical, will not burn properly at the pressure level you can use in the Charter.
Depending on the source, Winchester advises DO NOT REDUCE from it's data for the various magnums and Hodgdon advises no more than a 3% reduction. This is from 36,000-40,000 PSI loads! If you are not familiar with these powders, they have been known to cause catastrophic destruction of firearms when reduced loads are used. This is a real safety issue!
The Charter isn't a magnum in any way of defining it, not to mention it is so light that you would really know you had made a mistake if you ever light off a load in this gun which is capable of exceeding 750-800 FPS, they are too light, it will hurt!
For acceptable loads within this guns pressure limitations I would recommend Bullseye, Red Dot, Unique, 231, or any of the Hodgdon or AA powders in this burning rate range. 6.2 to 6.7 grains Unique works really well in the .44 Spl.