Sep 23, 2018
“MOVIE: NO TUNER.... This movie clip shows the powder's gas pressure traveling up the barrel at 1/4 inch increments. The deformations have been amplified by 500X so one can see the motions more clearly. If the deformations were not amplified the movie would show no motion and only the stress color fringes. These movies were calculated with an earlier pressure curve that delivered a 3685 muzzle velocity. Also gravity was not present since the barrel's downward sag amplified by 500X would obscure viewing the barrel motions. Note that the bolt moves aft a few mils from the chamber pressure. When the few mils is amplified by 500X, it looks like a big hole in the receiver.“