I have no idea how old this thing is.. It is a Ruger M-77, put my first 4 rounds through it today and would have to say I doubt the barrel is burnt yet.. Once I read the ballistics on the load I couldn't see a reason not to shoot it. Just like a 22-250 only faster and flatter.
I will use it for a while, then I will decide if if I need to switch to something newer..