I owned a Model 100 chambered for .308 in the early 1970s. It had some serious problems that Winchester did make right. The rifle handled great but I never got any groups better than 4 MOA out of it, so down the road went the 100. I just discarded the scope I bought and used on it (finally wore out and would not hold adjustments after 35 years of use) and then for for many years on my slug throwing shotguns, a 2 3/4x Redfield Widefield. I currently like the Leupold Rifleman series in 2-7 power. They are relatively inexpensive, not too large, have decent optics, hold their zero as the power is shifted and take the recoil of large calibers such as the .338WM and the .375H&H with no problem. Mine has seen about 1000 rounds between these two rifles and it holds it zero just fine.