I had a Ruger M77 MK II in 7mm-08. I had a few problems with this rifle that I eventually got sorted out with the help of Dennis Olsen In Plains, MT.
Here is the problem I still can't figure; This little rifle kicked like a mule. It had done this right out of the box and eventually Mr. Olsen made a custom muzzle brake that tamed this rifle considerably. But the initial problem of why the gun kicked so dang hard was never solved. Anybody have any experience with this problem? Could it have been due to head spacing? The type of ammo it ate made no difference. It bucked unbelievably.
I'd tell people that there was something wrong with the rifle (that it kicked like a mule) and usually they would scoff until they shot it. My .338 with a pachmyer decelerator was a ***** cat compared to this gun.
This gun was not accurate by any means and had dang erratic shot patterns.
I eventually took the gun to Dennis Olsen and he accurized the rifle for me and as stated earlier, hand-crafted a muzzle brake for it. He told me that Ruger had started mfg. these rifles with a single point (pillar) that protruded through the bed and the barrel tended to come to rest on this spot, which "de-tuned" the barrel. I hope I stated that correctly, because Mr. Olsen is one of the best gunsmiths in the world. I was lucky he just happen to live near the area I was guiding in. This is what I recall him saying to me on the accuracy issue, and any error in this statement is due to my bad memory and not his vaste knowledge of smithing.
When I got this rifle back from Mr. Olsen, it kicked like a .22 and could place 3 shop groups in a .50 pc at 300 yd.s, and that is absolutely no exageration.
I came on hard times, and my outfitter was nice enough to buy the gun from me at a good price. He told me if I ever wanted to buy it back when times were better for us, he'd sell it back to me.
I bought this rifle for my wife and she took her first big game animal with it (an antelope at 326 yd.s),she is a small woman (5') and now my son who is 12 YO is ready to start hunting as well. It always bothered me that I sold my wife's rifle. I should not have sold it, but as I said, we had a new baby and no food in the cupboard at the time. Now I am thinking of buying the rifle back and it occured to me that I never did figure out why this little gun kicked so hard. Any ideas? Sorry for the long email.