I have a pre-64 model 70 (FW barrel with rear sight boss) originally 30-06, rebored to 35 whelen AI. I haven't done much load development, but it's a 1-1/2moa gun just fireforming brass with factory remington ammo.
I haven't tried any 10 shot groups, but it stays plenty accurate over 5 consecutive shots...then my shoulder needs a rest.
A Featherweight with a rear sight boss? DO you have a picture of this?
