I'm not going to point a finger at your rifle, but I'll throw this in there. I used a Rem7400 to hunt with for the last 13years (it was my first deer rifle). I started out with aluminum see-through mounts because I didn't know any better. I would go to the range, and sight in my rifle. The best I could ever group was about 2in, mainly because the trigger was trash. I handled the rifle and scope with care, never dropped it. Each time I went to the range I would be anywhere from 6-10in off center. Once again I'd adjust and leave. Finally I was tired of the shot variance and did some research, bought steel rings and base to get the scope as low as possible, added the Timney Trigger fix for about a 3lb pull, replaced my simmons scope with a Nikon Monarch, and shot a ton of ammo to find what it liked. After that I could shoot 5 shot groups at 100yrds that you could cover with a nickel...while it would drive tacks after sight-in, it NEVER failed that the very next time I went to the range to shoot, I would be off about 6in again. I got fed up and replaced it with a Rem700 and haven't looked back.

That being said, my dad has a shot record going about like you, for the last 7 bucks he's shot at, he's missed or failed to recover 6...he just gets way too excited and rushes the shot without taking time to properly aim.