The site will be getting down for server maintenance next Wednesday starting at 8am CT. The site is expected to be down all day while we're doing site updates, so very sorry about the inconvenience and if you have any questions let me know!
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.