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David Sipe
Politicians and diapers have one thing.in common:
They should both be changed regularly, and for the same reason
You should check the rifles for cold zero.
On mine the zero changed more than three inches vertically during three rapid shots from a cold barrel. After it heated up it would shoot great groups. I attribute it to that welded lug. (Mine was also rotated about five degrees.)
Don
I cured my problem by having the rifle pillar bedded and the barrel free floated. My gunsmith said the could remove the barrel and put it in a lathe and true up the back of that extra lug, but thought I would be happy with it free floated. Well, now that I have shot a couple of hundred rounds with it in it current configuration, I have to agree with him. It hits the same place at 100 yds with a cold or warm barrel.
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David Sipe
Politicians and diapers have one thing.in common:
They should both be changed regularly, and for the same reason
You are lucky! The trapped stresses in the barrel due to the welding is what causes the group movement when the barrel warms while shooting. If the lug is not square it might affect the direction of movement, but not the magnitude.
Hopefully they have gotten the welding procedure and heat treatment right by now. The correct combination of pre-heating and pre-stress and post-welding heat treatment can result in an almost stress-free weld. I somehow can't picture Winchester going to that much trouble - and if they did, wouldn't you expect them to get it square, also?
Don