I have been still playing with my two ROA's with the Kirst 25 Cylinder. The latest is with Trailboss powder and trying to get a good backup load with the hard cast Lee 452-200 )305 gr) bullet.....that would group with the tound ball load....37,5 grs of Black Mag 3
The load I have settled on is....the Lee 452-200 (205 grs), hard cast and 7 grs of Trail Boss. This load, in the ROA 5 1/2", groups right on with the sights at 30 yards. Hitting the 10" gong at 50 yards is easy.
This loads burns very clen in the barrel, but does discolor the brass some...looks low pressure.
I have not chron'ed the load yet. but seems snappy.
Regards, James