Oh Thanks. So Slower burning powder means that the DBP10/95/87 would need longer barrels compared to the SS109 in order to maximize lethality. I wonder if the new DBP191 would have similar fast-burning powder like the M855A1 (upgraded US SS109 with a steel tip), especially since the QBZ-191 has the same barrel length as the M4 and short-barreled HK416. Otherwise, it would be like firing the old SS109 or M193 from the M4, of which US troops complained about the lack of lethality during the beginning of the Iraq War.SS109 62grain, 5.7mm gives 1.9g/mm2
DBP10 71grain, 6mm gives 1.97g/mm2
Then we have case capacity to area
Where 5.8 had 2.11 and 5.56 1.87, this means that 5.8 have more powder. The pressure is peak pressure so probably the 5.8 uses a slower powder that have higher pressure after the peak. The force accelerating the bullet is the area under the curve times bullet area.
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