+1 :thumbsup:Sean Gadhar said:I would look at something like 40gr. and see what group I can get, then move down by 5gr. increments, until I find a grouping load, or until I'm at a pre set bottom. You said 25gr. I wouldn't go any lower then that myself, and would try 30-40 1st for results IF you can get a group in that range.
Only thing I would add is that if you have a patent breech, be sure you have enough powder to fill it so you don't have a gap between powder and ball.