HI
I would try other brands of bullets and powder combos. Just because the bullet your are trying works in other guns doesn`t mean it will work in all. I have one gun that only shoots hornady`s. I would work up to max loads shooting at least three of every load. Also, stick with 1 brand of brass and check the neck thickness. If you necked down 300 wsm they are probably to thick. Good luck.
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