Bit of an update from me, ive since tried both the sierra 63gr SMP and the 65gr Gamekings, the 18" mod 7 shoots them both really well, the 65gr SGKs shot a 1 inch group at 200 yds without load development.
I also loaded up 5x 65gr SGKs to try in my 8 twist tikka, 25.5gr of 2206H at 10 thou off the lands, ended up shooting a 1/2" group at 300 yards! Will load some more to test further.
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