11-19-2013, 11:01 PM
I did an analysis last year using the GMX shape factor, and QuickLoad for velocity estimates. The parametric ran from about 75 grains up to the GMX weight (Sneaky R U listening?).
The bullet that seemed to have the best infantry-specific point blank range was between 95 and 105 grains. The PB was based on, I believe, the nominal 18" high torso.
And, yes, a bullet for the the machine gun is a question to ponder. One of the opportunities to think about is that the machine gun can indeed be designed to handle the bolt-thrust from higher intensity loadings that would fatigue the carbine bolt faster than comfortable. If the COAL is kept short enough to work in carbines, then the hotter MG round can be used in emergencies at ranges where the difference in trajectory is not an issue. In these emergency situations, a reduced bolt life is reasonable. First this kind of emergency won't happen very often, if at all, with modern logistics. Second, the bolts can be readily swapped out very soon after the emergency passes.
The bullet that seemed to have the best infantry-specific point blank range was between 95 and 105 grains. The PB was based on, I believe, the nominal 18" high torso.
And, yes, a bullet for the the machine gun is a question to ponder. One of the opportunities to think about is that the machine gun can indeed be designed to handle the bolt-thrust from higher intensity loadings that would fatigue the carbine bolt faster than comfortable. If the COAL is kept short enough to work in carbines, then the hotter MG round can be used in emergencies at ranges where the difference in trajectory is not an issue. In these emergency situations, a reduced bolt life is reasonable. First this kind of emergency won't happen very often, if at all, with modern logistics. Second, the bolts can be readily swapped out very soon after the emergency passes.