It is your rifle, and you can shoot it as much or as little as you want. You've identified the critical weakness is not the rifle (as far as you know), but the Butt Nut needs tightening. I wouldn't suggest you try to shoot a full match course of fire, but make a sincere effort to get to know what you are holding across your chest.
Once I had a whiz-bang combination 300 Win Mag that was going to do everything I wanted. I had some ammo, a place to hunt, had my gear, organized my share of the work for the hunting party. Great! Out to a friend's place. Fired some groups. Ok size, but tolerable. In for a penny, in for a pound, I fired the rest of the boxes. Crap! I kept getting fliers and the group weren't behaving to how I was twisting the knobs or aiming. Stop then. Consider the problem. It seems the recoil had shocked the Tasco scope and no wonder it was shooting awful; the recticle was damaged. Found some more money for another scope and ammo. Back out. Phew! Big relief when it did what I wanted and stayed consistent for as long as I owned that rifle. My lesson was - distrust everything until proven wrong.