Mike,
That is almost identical to the load I have settled on. 25.5 gr IMR 4198. I just got back from sighting it in. I have always used iron sights but, am using scope for first time. It's a Simmons 4x with weaver base. Took a total of 10 shots to get sighted in at 100 yards. Then shot 20 more shots for the fun of it. Took barrel off and shot different barrell then put 30 herrett back on and zero was the same.Simmons seems like a good scope. Clear and adjustments were good and have held (though it is a new scope) Am new to the 30 herret so these some of the few rounds I have loaded and tried. Called Hornady and they said I could go up to 26 grains with the 135 bullet. Did not note any pressure signs after firing 25 shots with 25.5 grains. I have a 7 tcu,30-30 and .357 magnum in 10 inch. Love the way the herrett feels and shoots with the 14" barrelAll I have to do now is what for deer season now!
I will wait until spring to try some of the laods with the Lil'Gun powder. Just not enough time to play with it.