I shot both the MR762 and MR556 at the range yesterday and below are the two best groups of the day. Both quite good, considering I did the shooting.
HK MR762
Range: 200 Yards
Bullets: 178 gr Hornady Amax
Powder: 40.5 gr I4895
Primer: CCI LRP
Brass: Lake City Once Fired brass
OAL 2.80
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HK MR556
Range: 100 Yards
Bullets: 69 gr SMK
Powder: 24.5 gr Varget
Primer: CCI BRP
Brass: Lake City Once Fired brass
OAL 2.25
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HK MR762
Range: 200 Yards
Bullets: 178 gr Hornady Amax
Powder: 40.5 gr I4895
Primer: CCI LRP
Brass: Lake City Once Fired brass
OAL 2.80

HK MR556
Range: 100 Yards
Bullets: 69 gr SMK
Powder: 24.5 gr Varget
Primer: CCI BRP
Brass: Lake City Once Fired brass
OAL 2.25
