[kiwi56]

I shoot both 223AI and 22-250AI and if I had to choose I would go with the 22-250. While the standard 22-250 will give you a velocity increase over the 223AI it is not a great deal of difference to the animal that gets hit with it but it certainly does reduce bullet drop and effects of windage and along with this slightly more effective range. If you really want to compare apples with apples why not move up to the 22-250AI and you will see identical velocities to the 220 Swift. I have found the Ackley Improvements on both cartridges when using 55grain boat tail bullets give increase in velocity of approximately 200 to 250 ft per second over the parent case. An added bonus is the reduced case stretching in the Ackley chambers.