quickdtoo, while I have not tried it, DJ says that his Handi 357 Max stabilizes 250's just fine. 1 box of them is cheap enough to try, and if they stabilize at 357 Max velocities, then more velocity is definately better. As well, Fred was discussing the Greenhill formula on another thread, saying that 180 is a better constant than is 150. If that is true, then the Greenhill as written will always give a faster twist than is needed. There is not that much difference between 1 in 18.5 and 1 in 12, not like the difference between 1 in 38 and 1 in 28, yet my 44 barrel stabilizes two different 300 grainers just fine, even when the formula says it ought not. Depends on the length of bullet to its weight. Give a few a blast from your Maxi barrel, worst case is that you spend some bucks finding some 250's that shoot well at lower velocity. If you have that, you will be good to go.
I hear that the 357 is slated for discontinuance this coming year, it was gone and they brought it back, I bet it will be gone for good now, so if one wants a 357 barrel, now it the time to get one.