Anyone here know / have favorable experience with a precise and proficient Gunsmith near New Braunfels, TX who will ream the throat on a Win M70 300 WSM?
Any good GS should have a 30 cal throat reamer and be able to cut a square hole.
I have 2, they have different leade angles.
You guys in the US have so much equipment 'right there' that you could buy one yourself. I like 1.5°- 3° leade angles personally. 1.5° for target rifles.