RE: M77 Hawkeye all weather in .280 rem.
The X-bolt is too new for me to have an opinion, only read a few articles so far and haven't even seen 1 yet. My go-to gun is a Composite Stalker A-bolt in 280, I use it more than all my other guns put together.. I've had in for at least 10 years now and absolutely love it. If the X-bolt turns out to be the equal of or better than an A-bolt, I would buy 1 in a second.
Put the best scope you can afford on your rifle and dont look back. I like Nikon scopes myself,I have them on a few rifles.My 280wears an older Monarch 3 x 9.