Kix,
These old Mausers can shoot some pretty accurate groups. But from what I have see (from shooting my own 6.5 Swede and from observations of others) is the cartridge OAL has a lot to do with it. So, if your just loading it to SAMI OAL you may have to "re-think" that.
I don't know if you have measured the freebore of your chamber or not, but you may want to do that. There are several ways to do this and if your not sure, a quick search will probably get you your answer. But, suffice it to say, you may need to seat your bullets a bit longer than the SAMI max....again, depending upon your chamber's available freebore.
Dave