Had a Winchester Model 70 DBM in 30.06. Complete crap.
Wouldn't hold zero. When I took it to the gunsmith, the barrel was so loose he could turn it by hand and this was a brand new rifle. Had that corrected and the damn thing still wouldn't hold zero. Glass bedded it, even though it came in a synthetic stock and had something akin to a chewed condom stuck round the recoil lug, still wouldn't have it.

It would occasionally shoot an outstanding group and then next time out the case would wander again.
Repeated trips to the 'smith couldn't get any kind of consistency at all. Eventually bought a 1923 Mauser 7x57 and never looked back.

My local gunsmith has been very scathing about the quality of winchesters. It certainly put me off them. Nothing wrong with the calibre. My shooting partner has a Mannlicher in 30.06 and it's as sweet as a nut, powerful flat shooting and versatile. Pity my rifle wasn't the same.