I shoot my iron frame Henry exclusively with triple 7. My load gives me 1365fps average with a 210 grain bullet .44 caliber. If that doesn't satisfy you, you need to stick with the 92. As you go up in bore size, you can still stay within that velocity range, between 1200 and 1300 fps with correspondingly heavier bullets.
I know some people don't like to mess with black or black substitutes, but triple 7 is as close to a smokeless style powder as you can come and still have the pressures of black powder but the clean up of smokeless. Yes, it is slightly more powerful.
My load is 30 grains of 777 in the .44-40. Remember, these guns are strong enough for the pressures and velocities of the day! If you are a speed junkie, stick with the 92/94 style actions.
Dan C