What where your load particulars on your 300 ULTRA 200gr Accubond RL-25 load. Seeing your awesome 300yd group is one of the reasons I've turned back to working with this particular bullet.
Are you also the poster who did some experimentation with action screw torque on your Model 75?

Thanks for the inspiration......DJ

OK:

The COAL is 3.7" Looooong magazine on this 75.
Federal 215 match caps
Rem brass
92 gr of Reloder 22
200 gr Nosler accubonds.

This SAKO likes the action screws torqued only to 30 in/lbs
The last one I had got .9" at 300 yds with the 180 Partition Golds and AA8700 but it liked the screws at 50 in/lbs....
Go figure!!!! Anyway both are SAKO 75 Fiberglass/stainless stock factory guns.