Congrats on the new gun! I have a Winchester M70 in .308 that looks just about like yours, but it came without any open sights at all!
BTW, I got 6 stitches from that .308!!!! It's not that much recoil, I was holding it at a bad angle making a hunting shot!
Also, except for the big kickers that you KNOW that you've shot after the first shot, recoil is cumulative, after a box of shells or so in one sitting, you'll feel the difference between the .308 and a .22-250!
Again, congrats!