Question for you guys. Today I was seeing how my 7 rum would like some 175 gr sierra gamekings with 88 and 89 grains of retumbo. It seemed to like the 88 grains with a 1.5 inch group (best I've achieved so far with the gun). Now with the 89 grains. I had a string of shots about 6 inches across the target and the bullet holes weren't perfectly round. All the holes with this load had a small rip outside the perfect round hole. The holes looked like the cut an out of tune bow makes shooting through paper. Is it possible my bullets are tumbling and causing this?