Pat's photos and experience should be sufficient.
My friend Dober, who used to post here, has used a 22-250 as a deer antelope rifle for over 30 years with the standard 1-14 twist.
I'd probably go with a 1-8 or 9" starting from scratch.
In the early 1950's my father used to fly the state of Montana. In the winter he'd have skis outfitted on his plane, delivering groceries and mail to snowed-in, isolated ranches. He'd always sit down for a cup of coffee, and in Eastern MT, there was invariably a BIG mule deer on the wall. He told me 9 times out of 10 you could count on it having been taken with a 220 Swift...
At our house, we've only used the 223, and only on antelope.
