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There is one problem with your assumption and that is people are downloading using the same powder. As a general rule you do not want to go below 70% of the case capacity. You can change powders to one that still gives +70% case capacity and yet provides a lower velocity. One reason to do this is to graduate yonger shooters using dad's or mom rifle. You can dowload the 30-06 to 30-30 velocities and as they get older you can increase the powder charge and velocity. You may also want to download if your hunting conditions do not require maximum bullet performance. For example hunting in the northeast where most shots are under 50 yards. Why waste the powder if you do not need it.
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