anybody got a good load for a 300 ultramag using a 220 gr bullet and old H4831

I use 168 grn bthp in my ultra mag with the 4831. My Barnes manual says 68 to 73 for the 220. I keep my loads down toward the min side. Seems like a waste of powder to go up any more with the charge. I kill everything I shoot at with what I am at.