Re: 338 300gr BC
The more ranges you can confirm drop at the better but you do not have to go every 100 yards.
If I am setting a rifle up for 1000 yard drops, I will shoot the zero range and then generally 500, 800 and 1000 yards. If all your drop numbers match up at these ranges, it will match up in between as well.
If I am setting a rifle up for serious long range, say out to 2000 yards, I will shoot at 500, 1000, 1500, 1750 and 2000. It also never hurts to record drop numbers for ranges farther then you plan to shoot just because it adds to the accuracy of your drop chart.
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