250ai

[tigercat]

what is the caliber 250ai what does the ai stand for and is the same as the 250/3000 thanks guys need a gun for my ten year old daughter

[The Sodbuster]

The AI stands for Ackley Improved.  P.O. Ackley "improved" a lot of cartridges that now bear the AI moniker.  Mostly, he blew out the sides of the case to make them more or less parallel, rather than tapered, and increased the shoulder angle.  The .250AI is a .250/3000 Savage that's been rechambered for Ackley's improved design.  If I understand correctly, you would load .250 Savage brass in the improved chamber and fire form the cases to the AI spec's.  You gain a little in case capacity and velocity.  Whether or not it's worth it is up to you.

[Brithunter]

what is the caliber 250ai

    .250AI is a cartridge and not a calibre. .250" is a calibre as it's a 1/4" bore or 0.250".

    With AI cartridges one of the benefits is improved case life. The .257 Roberts AI is according to Ackley's book one of the best for improved performance and effieciency. One of the beauties of an AI is being able to use std ammunition although it will give a slightly lower velocity, or normally will give a lower velocity due to some of the enregy being used to expand the case to fit the Improved chamber.