Bought a pound of T-7 to try in the Lyman Mustang last week, and decided to try the T-7 in the plains pistol this evening. Haven't shot the pistol in quite a while, so it took me a few shots to settle down and get intodecent shooting form. After a few round ball rounds to get me used to the feel & trigger pull againI went to my favorite projectiles, Lee REAL bullets.
I was shooting offhand at only 50 feet since I haven't shot a the pistol much lately. At that range with 40 grains of ffg T-7 and the REAL bullets I shot an under 2" 5 shot group. With that charge the pistol had some recoil, but not really uncomfortable, and perfect ignition every shot (using CCI 11Mag caps). The suggested max load for the pistol is 40 grains behind a .490 ball, but I've shot conicals in it for years and never had any indication of excessive pressures.
I might even go to the trouble of chronographing that load one of these days, if my hunting buddy will loan me his chronograph. He put a sabot through the display window on my chronograph, so I don't have one anymore...... but then he might figure I plan to get even and refuse to let me shoot through it with a muzzleloader.

I'd say that load will probably be what I carry in it when I packthe pistolonmy trapline this winter.