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Sierra's 180-gr. match bullets have been shooting from .308 Win. ammo in match grade M14NM's, M1's, and various match grade bolt guns with 1:12 twist barrels into 1/3 MOA at 200 yards, 1/2 MOA at 300, 2/3 MOA at 600 and 3/4 MOA at 1000 yard since the 1960's. They were a favorite of the US Army and USMC Rifle teams back then.
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That's crazy. I can't tell you how many times and in how many ways I googled "1:12 180 grain 30 cal" and all I could find was people suggesting you had to have a 1:10 twist to shoot anything heavier than 165. I guess that shows you what the majority of internet gurus know.
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is that true, 180 gr hurts or something?
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That's relative to what bullet weight you'd be shooting otherwise. Force= Mass x acceleration, and for every action, there is an equal and opposite reaction. Meaning the heavier the bullet, the heavier it hits you in the shoulder.