Comes down to how much you are going to shoot it in a sitting. The smaller the barrel the quicker it heats up and starts throwing bullets. I recomend that you use a heavier contour like a straight taper to 1" at the muzzle. A heavy sendaro with a .9 muzzle will work well for you also. Just note that the heavier the barrel the more consistent it will shoot and more shoots before it gets too hot.