if ya go with a Douglas, check out IT&D Gunsmithing in Ohio...
they have Douglas barrels in stock and mega reasonable prices with fairly quick turnaround....
I have two rifles with rebarreled 22.250 barrels on them...
I like them to be mobile, but wanted a little more than just a sporter barrel... so I went with a heavy magnum contour... same size as a 458 would be chambered in...on both..
+1 for Dave and crew. I'd go with them and Douglas for price and turnaround time.
If it was mine, I'd be thinking about a #3 or #4 depending on use, and I'd consider a faster twist for heavier bullets.
DF