Ok, so whats the skinny about my microgroove compared to a ballard rifling? Just keep my velocities down to around 1600 for a 405gr cast? Does hardness of the cast matter? What cast out there is a good combo of hardness but goes down the barrel good? I was looking at Beartooth. Anybody shoot Laser Cast thru with microgroove? I love em for target but not sure if they are hard enough for hunting.