Brik:
I used the Lee, 380gr, .54, R.E.A.L. in my Lyman GPR-Hunter 1:32 for several years with consistent accuracy results, specifically at 100yds.
This summer I changed to the nicely pointed Lyman, 425gr, .542 hollowed based Minie projectile.
Ironically the same 90gr of PyrodexRS produced increased velocity and an even tighter group.
Even though I'm not real thrilled with additional knockdown power on my end of the rifle, it should prove to be a great hunting load.
Osage