[Retlaw]

Originally Posted by walkinman221

They can be tweaked or tuned, to up their power if you know whats what.Older or conventional spring powered air weapons have a practical upper limit of 1250 ft/s (380 m/s) for .177 cal (4.5 mm) pellets. Higher velocities cause unstable pellet flight and loss of accuracy. This is due to the shock wave generated as the super sonic pellet contacts the air. Shortly after leaving the barrel, the pellet falls below the speed of sound and the shock wave overtakes the pellet, causing it to tumble. And as for his disregard for gun safety any post with the words carefree and weapons in it makes me worry sorry.

.177 pellets could not be driven down a barrel at those speeds, the contact between the pellet, and the rifling lands is so small an area, that the pellet would strip the rifling, you would need a completely different pellet profile, and rifleing twist in an air rifle to attains those speeds, and maintain any reasonable accuracy.
Properly profiled bullets with a ballistic co-efficiency below .4, can be driven a speeds in excess of 3000 ft per sec, in a 1/10 twist, and still be acurate at well over 1200 yards, even after they've gone sub sonic
Retlaw