If your rifle looks like the one pictured on your owners manual, then you definitely have a Winchester, a variant of the post '63 model 70. Arguably a better rifle than a Remington 700.
My uncle had a Ted Williams 270 and it was a Winchester (70, 670 ??). As I remember, it was also a very nicely finished gun, my Dad borrowed it a couple of times.
Shouldn't it say Winchester somewhere on the barrel?
menu down to where they have the "cross-reference" section of seller vs manufacturers. You'll get that confirmation.
Would it be possible to get a copy of your manual? it will go good with mine!
Enjoy.