I have some 55 grain Speer TnT bullets I bought in the mid 90's. The statement from Speer was not to exceed 3400fps. The failure of the bullet is based not on its linear velocity but on its rotational velocity.
Most barrels for 223 and 22-250 were twisted 1/12 to 1/14. My Windham Varmint Exterminator is twisted 1/8. 1/8 is 33% faster than 1/12. So theoretically I should only be able to fire that bullet at 66% of the maximum of 3400 fps to have the same rotational velocity. That would be 2240 fps by what I figure.
Am I wrong?
