Here is what i wonder. We shoot Varmint for score out to 300 yards here at our local shoot. I feel like the 30br gets pushed around a bit to much on that 300 yard target and i just dont score that many x's. Would the Grendel be a good 300 meter cartridge or would the 6br in an 8 twist still be better? I went the 6br route with this new haverkamp, and i will soon try it out, if i ever get a stock for it. I am also going to try some 125gr 30cal bib bullets in my 30br. Maybe they wont get as much wind drift as the 118's do?? I need to be real honest though after saying all this. I shot the last 300 yard score target with a ppc and a bib 68gr BT and i was really shocked in the accuracy. I won that shoot, and i think it was the best 300 yard target i have ever shot. So maybe, just maybe, the 6ppc is the best 300 yard cartridge???? And if you cant tell i am always looking for excuses to buy new barrels! LOL!!! I love this stuff!!!! Lee