That's all I can find around here, 45 grainers, not 55. The purpose of the 22-250 is to reach out further than the 223. 45 grainers defeat this purpose. Might as well shoot a 223. And the terminal results at close range aren't any more than using 55 grainers. Red mist is red mist. The purpose of the 45 grainers is to be able to offer a budget line of ammo by reducing the amount of metal in the bullets.
I'm stunned at this thread. This many people using and seeking factory ammo for a cartridge that only truly reaches its considerable potential after careful load development via reloading. It would no sooner cross my mind to buy factory 22-250 ammo than to undergo sex change surgery.