Model 70 220 Swift

"Model 70 barrel..."

Uhm... I may be wrong, but I don't think that I am, but I'm pretty sure that Winchester uses a 16-TPI V thread, while the Sprinfield uses a 10-TPI square thread.

And I believe that the thread shank on the Springfield is larger than on the Winchester.

How could that be done? are there adapters?
 
The barrel could be cut to be 'set back', threaded, and then have the chamber re-cut (deepened). It's not ideal for chamber wall thickness, but I've seen it plenty of times with various rifle/barrel combinations. I've also seen barrel shanks turned down, thread adapters installed, and then the assembly torqued into the receiver. (I came across a guy doing this to a Marlin 336 as part of a take-down conversion, a few years back. Talk about pushing the limits of thin chamber walls in a model already known for lacking 'strongness'!...)

As always, a good photo would probably quickly reveal whether or not that was done.
Posting photos sticky: Posting pictures
 
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