Each rifle barrel is a world unto it's own for sure. My .270 is a custom pre-64 model 70 with a Douglas barrel. It doesn't like the 150 grain bullets for some reason. As far as I know from his writings, Jack O'Connor always loaded and used the 130 grain bullet. He never mentioned the 150 grain loadings and didn't list it in his recipes for the .270. I love the .270 and it also makes a great long range coyote gun.
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