The 250-savage would likely be a safe factory loaded round on the AK. its pressure is 45,000 CUP. its loaded length is about the same as a 308 win.
it not cheap for brass and loaded ammo is pricy but it would be a calibure that a guy could go to the store and but ammo for it.
the round is not any better than a 243 or any thing but it is a good and once very popular round.
MY Mom has a 250 sav on a model 99 Savage an I may be reloading for it soon. I might have to find a 25-06 barrel and rechamber it since i will have dies and brass. it appears that brass can be formed from 270 with out special dies. according to my book.
I like the idea of using rounds that are safer in factory loads.