I just had a full custom 26 nobler built with a 26" rock creek 8 twist.
90 grains of reloader 33
cci primer
140 berger hybrid
MV 3392 fps
ES in the single didgits
2" groups at 600 yards
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87 grains of reloader 33
cci primer
160 matrix vld
MV 3281 fps
ES ?
2 1/4" group at 600 yards