Since I use the O'Kane constant bearing method, I try for around 600 yards because sometimes when I raise the scope for the final firing observation, the target has slipped "inside" the planned setting to less than anticipated. If set to 500, you might be cutting it really close if it slips inside 450. Since my final scope firing observation is 10 degrees before firing, there just isn't usually enough time to reset the TDC.
Last edited by Gray Lensman; 08-28-16 at 12:24 AM.
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