Just reading over my notes for the ladder test I did yesterday. Picked up the 165gr. SST bullets from a friend for dirt cheap, sitting on just under 200 of them now.
Rifle: Winchester Model 70, 22" featherweight contour barrel 1:10 twist
Bullet: Hornady 165gr SST
Brass: Winchester (once-fired)
Powder: Winchester StaBALL 6.5
Primer: Winchester Large Rifle
COAL: 3.248"
56.0gr Velocity 2637/2695/2664 min/max/average
57.0gr Velocity 2686/2737/2717 min/max/average
58.0gr Velocity 2788/2811/2799 min/max/average
59.0gr Velocity 2842/2866/2854 min/max/average
59.5gr Velocity 2866/2905/2891 min/max/average
60.0gr Velocity 2897/2915/2903 min/max/average
60.3gr Velocity 2936 (only had one of these loaded) ***BOOK MAX***
Hot weather, 32 degrees ambient, no stiff bolts, no flattened primers, no signs of excessive pressure. Accuracy node at 60.0 worth exploring - even with the Magnetospeed on a thin contour barrel and not really focusing on groups (just data collection) this one was right under 1 MOA.
Rifle: Winchester Model 70, 22" featherweight contour barrel 1:10 twist
Bullet: Hornady 165gr SST
Brass: Winchester (once-fired)
Powder: Winchester StaBALL 6.5
Primer: Winchester Large Rifle
COAL: 3.248"
56.0gr Velocity 2637/2695/2664 min/max/average
57.0gr Velocity 2686/2737/2717 min/max/average
58.0gr Velocity 2788/2811/2799 min/max/average
59.0gr Velocity 2842/2866/2854 min/max/average
59.5gr Velocity 2866/2905/2891 min/max/average
60.0gr Velocity 2897/2915/2903 min/max/average
60.3gr Velocity 2936 (only had one of these loaded) ***BOOK MAX***
Hot weather, 32 degrees ambient, no stiff bolts, no flattened primers, no signs of excessive pressure. Accuracy node at 60.0 worth exploring - even with the Magnetospeed on a thin contour barrel and not really focusing on groups (just data collection) this one was right under 1 MOA.
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