pamtnman,
The "hangtag" target that came with my 7x57R showed it had been sighted for the 11.2 gram bullet and I think this was pretty common practice. It seems yours was proofed for the 139 grain steel jacketed bullet. I mostly use the 11.2 gram HMK with complete satisfaction. You should use which ever load gives the best groups and a POI that is useable with Brennekes.
Mike