Thread: Twist rate vs velocity vs bc

Originally Posted by 199p

One thing i do remember with barrel twists from reading a while ago on the 22-243 is that you can over spin the projectile fast enough as when they get the full drag through the air they can break apart and vaporise.

Im sure it was a thread buy KiwiGreg or crazyman

I found it very interesting goes to show that you want the correct twist for bullet and velocity as shown at the extreme end.

My Ex Cryzman 26", 1-7, 22-243 shooting the 90 Bergers at 3100-3300fps is extremely accurate.

The trouble starts when the barrel gets warm, the warmer it gets the lower the velocity threshold is when the projectiles vaporise.

The heat build up going down the barrel & through the air melts the lead between the jacket & core, the bullet gets unstable & disintegrates between 50-100 yards out.

I had a "butterfly" hole in one of my melamine targets once when the projectile let go directly in front of it at 100 yards.

At 31-3150fps you can shoot around ten rounds in summer before its an issue, at 3300 one or two if you are lucky.