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Joined: Oct 2009
Posts: 5,834
Campfire Tracker
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OP
Campfire Tracker
Joined: Oct 2009
Posts: 5,834 |
Just pulled the barrel from a new FN M70 that I intend to rebarrel. To my surprise, the threads are 1 1/16" x 28 TPI. FWIW, this was a S/A FWT. Anyone else seen this? Wonder if it is something to do with the FWT or if it is a 'full blown' change at FN. Friend of mine pulled the barrel on a FN Super Grade WSM before Christmas and it had the 'standard' Winchester barrel threading.
I never thought I'd grow up to be a grumpy old man, but I did, and I'm killin' it.
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Joined: Jun 2004
Posts: 7,202 Likes: 6
Campfire Tracker
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Campfire Tracker
Joined: Jun 2004
Posts: 7,202 Likes: 6 |
This thread change was initiated by Winchester at New Haven in response to the problems encountered with oval chambers; this especially in rifles chambered for the WSM cartridges. The culprit was found to be a combination of a poorly fitted thread, the comparatively thin wall of the WSM chambers, and the interupted (broached through)thread on the Model 70 receivers. I had called Winchester about this and told them I was now re-threading to 1 1/16 x16 on any WSM rifles I barreled. I was later told by one of the engineers that they had made a change to the threads on the actions for the WSSM rifles and this change was expected to carry over. I assumed, at the time, that they had simply enlarged the thread to 1 1/16 as I had and was quite surprised to see the 28 TPI threads. This change certainly makes for a thicker chamber wall and more importantly, the interupted thread is gone. I'm frankly surprised to hear that your friend's rifle had the 1 inch threads. I didn't think FN would have produced any of these. By the way, I doubt that my conversation with the technical staff member had anything at all to do with the change in thread size. I think the change was already in the works in response to a large number of warranty claims on WSM rifles although most Winchester spokesmen at the time would simply deny there was any problem. GD
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