I've owned a number of Win 70s over the years, many with barrels by Shilen, Douglas and others. I'm looking at a Proof carbon barrel for a Win 70 and I'm wondering if the cylinder size is appropriate for a Win 70 receiver, the Proof cylinder is 1.2". I understand I could ask my smith but undecided at this point who I will employ to do the fitting. Some may think this is sacrilege for a Win 70 but it's probably the only way I'll end up using this particular rifle.

https://proofresearch.com/barrels/bolt-action/

Thanks in advance!

1.2 is just fine. This means, while disgusting on many levels, the barrel should work fine on your Model 70. GD

I understand your disgust but it's the only way this rifle will see any use these days, have not hunted with it since I replaced the barrel (#3 for this rifle) and stock. Stock and barrel will be in classifieds eventually.