That Speer bullet sounds exactly like what I need, unfortunately being in Canadayou tend not to see as much variety in bullets as you do down South, and you need to have someone do a proper importation for them. Currently I have some 235grn round nose soft points I have tried in two rifles and haven't worked. It seemed to do ok with this one, however I wasn't shooting paper rather watching impacts in the snow and adjusting on to clays that way.
Just got in some 225grn .323 spitzer boattail bullets pulled from 8x63 surplus, I might play a bit with those but who knows if the rifles will actually shoot it.