I have a 220 Swift, 220 Wilson Arrow(Swift-based wildcat), and 2 22-250s. I love the Swift and Arrow, but I have to agree about brass scarcity. 22-250 brass is MUCH easier to find. I'd go 8 twist so you at least have the option of using heavier bullets should you choose to. Hot 22s make a great deer round when the proper bullets are used.

Those who must raise their voice to get their point across are generally not intelligent enough to do so in any other way.