Well, from what I've read here and elsewhere I'm going to chalk this one up. I thought I'd add a second 7x57 to my M70 but may look elsewhere.
I've got one tang model left and its a 7 Mag. No flys on it at all. I've never had a M77 I couldn't get to shoot and I've had several. If I was in the market for another 7x57 I'd have no qualms about a M77.