My buddy has a tang safety M77 in .270 that shoots MOA with just about any ammo you put through it, factory or handloads.... He bought it in 1973 or 74.. I had tang safety M77s from about the same time in 25-06 and .338, and they were also tack drivers.. However, I also had a tang safety M77 in 7x57 that shot PATTERNS rather than groups..
Chances are that the rifle you are considering will shoot well..Actually the least accurate .270 I have ever seen in any make or model of rifle still delivered pretty good hunting accuracy.. Most have been very accurate...