IF I UNDERSTAND RATE OF TWIST CORRECTLY... 1-9" TWIST IS BETTER FOR A HEAVIER BULLET. ie 1-12" FOR 40-55 GR. & 1-8" FOR 65-75 GR. IS THIS CORRECT.? SO WITH MY 1-9" RATE OF TWIST I SHOULD BE GOOD FOR 50-60 GR. AM I EVEN CLOSE??