If you want a 22-250 and you find a 788 that works and is for a price you like, you should buy it. If it turns out you don't like it, a 788 in serviceable condition isn't hard to sell.
I had one in 22-250. I bought it sight unseen by telephone from a gunshop that had just taken it in trade, not really knowing anything about them. But it was a suitable coyote calibre, with a detachable magazine, which I really like, and affordable on my limited budget, so I took a chance. Initially it produced 12" groups at 25 yards, with some rounds keyholing, but that turned out to be copper fouling and Barnes CR-10 cured it, and I was pleased with its accuracy. I sold it for $25 more than I had paid, when I found something in .223, because that's what I really always wanted to use. The fellow who bought the 788 told me he was really happy with it (he got groups that proved the rifle was better than I was.)