I've been using 75 gr fffg Goex in mine so far, and the results look promising. But, like you, I haven't been able to set at the bench and really give it a test yet.
I'm hoping I can find a conical it likes, and the Lee 250 gr REAL has looked good so far. But 25 yards offhand isn't really much of an indication of what it can do, so don't read that as being a suggested load!