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and burn rate has nothing to do with it... density does. Take Hodgdon's .308 loading table. For a 155 grain bullet, 51 grains of H414 is the max load, while only 46 grains of H4895 is a max load. H414 burns much slower than H4895, so what gives?
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I disagree , What gives ? the burn rate . Why can't you put 40gr of Titegroup in that 308 case ? Burn rate - OK it's density then, hmm Why can't you put 40gr of Unique in that 308 case ? 1 it won't fit and 2 burn rate . You see this in just about every cartridge . The faster the burn rate the lower the charges will be to get the same velocities up until you blow your gun up with the faster powder trying to get velocities you can only get with a slower powder . Density may play a roll but burn rate is a much larger factor or my understanding of internal ballistics is just flat out wrong .
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