"For What It's Worth"/FWIW.
M722s in 257 aren't that rare, but I've seen two that I wanted and didn't get. If I recall, they were tapped for receiver sights, as all of them I've seen, were so equipped?
Prices vary. Saw one in mint condition about three years ago at an auction, with a Unertl scope. It had once worn a receiver sight, because the stock was notched out there.
No one seemed to be interested in it, when I looked at all the firearms laid-out in the farmhouse where the sale was. The room was full of M94s and M12 Winchesters, which drew most of the attention. Left before the auction, because someone I knew showed up and wanted the M722.
He later said two guys both wanted it and the price went up rapidly, think it went for close to $600, which was likely more than it was worth?
A Tioga cousin's wife has had one for many years and killed an awful lot of deer with hers, but she won't sell it to me.