I notice that there's a 30+ fps variance between all 5 rounds in some groups. Is this normal? Should I try crimping or magnum primers next?

I didn't see any keyholing at 50 yards but the rifle in question averages sub-MOA past 100 yards and these groups averaged around 1.5 MOA at 50yd.

Some info:

Gun: Ruger Gunsite Scout 1:10
Optics: 2-7x32 Vortex Scout Scope

Brass:
Lake City, trimmed to 2.005
Bullet:
Sierra MatchKing 175gr
Sierra Prohunter 220gr RN
Powder:
Trail Boss (9-11.5gr)
Primers:
CCI #200
Length:
SMK; 2.78
RN; cannelure
No Crimp



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