'64 win.

[Nomadhunter]

I've a 1964 Win., M-70, chambered for weatherby's 270 Magnum.

I do not know the twist ratio or the factory recommended load at the time of production.

I am just seeking a knowledge base and a starting point.

 

[Dans40X]

A reloading manual will enlighten you with the info that you seek.

 

[Nomadhunter]

A reloading manual will enlighten you with the info that you seek.

Thank you.

 

[jonbearman]

That sounds like a rare model 70 in a weatherby caliber.