"wouldn't less projectile contact with the barrel's rifling cause an accuracy issue?"

No, the TSX and the newT-TSX are the most accurate bullets out of 4 of 5 of my rifles. They shoot sub-moa out to 400yds in 3 of these guns. The only adverse affect the grooves have is in the way of ballistic coefficient. This is why the new Noz Etip might be the best of both worlds.

Brett