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I was having extraction issues with my Ithaca M37. Closer examination showed the crappy low brass heads of the Winchester ammunition were expanding into the extractor cut-out. This reduced the amount of bite the extractor had. That coupled with tired extractor springs (pretty old M 37) compounded the problem. I sent ammo back to Win. who said it was
good ???
I put new springs in place and all seems ok. I will find out for sure this summer when we shoot a little trap...
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