Those 77/22 magnums are excellent shooters when you get a good one. I have one in stainless w/factory laminate stock. Picked up a Green Mountain combo set of stainless "bull" 22mag and 17hmr barrels for it when they had a deal, then ordered a Richard's "electric blue" laminate bench stock. Mounted a BSA Contender 8-32x50 scope and installed a Jard 1-1/2# trigger assembly, she was quite the shooter.
Since then I changed everything back to stock, except the trigger setup and remounted a Simmons 44MAG 3-12x44 scope. Still a great shooter.