Is this for a Hunting or Target Rifle?
0.6 MoA is pretty effing good for a factory mass produced rifle - with or without a Heavy Barrel.
Any of those groups - with the exception of 42.8 grns - are more than acceptable for most hunting you'd do in NZ, and very acceptable for any Precision/Target shooting. I stopped doing any development once I could consistently shoot 0.6 MoA groups with my 6.5CM Target Rifle - any further effort would yield limited benefit...
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