Great way to kink a tube. I'd get a normal mount, a CTR and a Larue RISR if I needed it "low".
You're guessing it won't effect your rifle until you get out past 300. You've got some nice stuff on that rifle, why limit its potential by simply using it in a less than ideal setup?
And BTW, tubes move...a lot, and that ain't going to do anything positive for your scope.