I shoot the Sierra 69gr HPBTM out of my White Oak match rifle, it has a 1/7 twist. If they are moving at 3,000 fps when they leave the barrel, they will be spinning at about 308,000 rpm, whats the worse that can happen if there is some tumbling media stuck in the hollow cavity at the front. The cavity is actually quite deep, stick a pin in and you will see.