weird happenings at the range today.

[Blacksmith101]

If you want to shoot varmint bullets, thin jacket to insure expansion on thin skinned small game, then either get a slower twist barrel or load them to a lower velocity. The 1 in 7 twist is needed to stabilize longer bullets like the 77 grain ones. Google "Greenhill Formula" for an explanation of twist rates vs bullet length.

This link has a good basic explanation and mentions varmint bullets:
http://www.armalite.com/images/Tech Notes\TECH NOTE 110.pdf

--Third, some projectiles have relatively fragile jackets (notably varmint bullets). Spinning these projectiles too fast can cause the jackets to rupture in flight.

 

[stillwillin]

If you want to shoot varmint bullets, thin jacket to insure expansion on thin skinned small game, then either get a slower twist barrel or load them to a lower velocity. The 1 in 7 twist is needed to stabilize longer bullets like the 77 grain ones. Google "Greenhill Formula" for an explanation of twist rates vs bullet length.

This link has a good basic explanation and mentions varmint bullets:
http://www.armalite.com/images/Tech Notes\TECH NOTE 110.pdf

Good basic reference ...Thx