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From Alliant 1996 reloaders guide, for whatever it may be worth, in 6.5x55 24 in tube.
Speer 140 spitz- cci 200 primer-48.1 grains rl-22-2,700 fps-44,400 cup
yup, it is conservative compared to the 51,800 cup listed for 264 win mag load.
Also likely to be outdated pressure measuring technique.
Am using 48.0 grains under hdy 140 sp for close to 2750 fps from 22 in Win, or CZ. With win brass and col=3.035 in..
Rem factory clocked 2530 fps from 22 inch barrel.
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