Quote:
Originally Posted by wpage
Drag coefficients.
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Not entirely true but it does apply somewhat. Its because the copper jacketed bullets are harder and produce more pressure in a given cartridge. thats why you usually get more velocity with the same powder using jacketed. You can use jacketed data with lead but never substitute lead data for jacketed ESPECIALLY toward maximum charge you could end up with a busted gun... just be safe and try to stick with specific data for the bullets you use
