Quoted: If you don't plan on shooting above 69 grains the 1/9 will work just fine. 1/7 will handle the 70-80 gr rounds much better.
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That's my take on the 1:9 twist as well. I also think that the 1:7, in my experience, runs great for grains between 62 and up. People will of course chime in to say they shoot 45 grain bullets from their 1:7 barrels and 77 grain bullets from their 1:9's....so take it all with a grain of salt and make your final decision from your acquired knowledge after reading the ammo oracle.
Generally...
55-69 grains 1:9
62-77 grains 1:7
If you're a
varmint, target, and zombie shooter, get a 1:9
If you're a
competition, target, and zombie shooter, get a 1:7