How would a Pac Nor 7mm Twist: 1 in 8.00
L/G: 5 Diameter: 1.153 Length: 26 Steel: CM Grade: Match
Contour: Sporter
Comments: Chambered none - 1.153" dia x 1.75, 40" radius for 2" to .860 taper out 20.25" to .565@ 24"

Work on a pre-64 M-70 chambered in 7x57, length to be 23"?

Would the 1:8 twist be suitable for 140-160 grain bullets?

PacNor has this one in stock without the wait.

Sounds like a nice rifle in the works. Plug the #'s into this formula and see what comes up.

http://www.uslink.net/~tom1/twistrate.htm