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bergerbullets.com
edit - If I had a choice of 1/8 for my 300wm or stay with 1/10; I'd get 1/8. more options. If 215 is as heavy as you are going to go, i'd go with 1/9. ps edit - my sako trg RIFLE - 300 win mag shoots 1x10 twist, 215 bergers out of a 27" barrel around 2900 fps. It groups less than .5" at 300 yards with the load. I'd still prefer a 1:9 based on Berger's stability chart.
I meant load data with the 215s. I have shot up to 240s in a 10 twist 300WM so wondering if it’s your load data that may not be letting the 215s work for you.
might want to step up to some better brass. If you're going to chase the rainbow, you might want to invest in some more consistent brass like Lapua. edit - like rob01 said, what other loads have you tried with your H100? I believe there's a whole reloading section on 300 win mag, with combinations.
What loads, with this combination of components, have you tried to settle on that one? Those components are fine but if you haven't found the right load with them may mean you haven't tried the right combo yet.
i went to shoot today i don’t know the fps but i used nosler brass 215 berger h-1000 /75.5 grs cci primer i set it at 4 different settings off the lands but .090 works the best .25 to .50 at 100 yds