Have his start with 100 grains. If that groups well, have him kick it up to 110 grains and see what happens. If that groups well, then kick it to 120 grains if he feels he really needs that powerful of a charge. Again check the groups. Then shoot the amount that gives you the tightest group.
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
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