Really, 1100 yards for elk or moose sized animals? Stretching it a little arnt you? I am not familiar with the 6.5 Gibbs but I am guessing it produces a little less than a 264 Win mag. I have had a 30 Gibbs for about the last twenty years, it is close but not quiet a 300 win mag, a pain in the butt to fire form cases in my opinion for something that falls a little short of a 300 mag that I can buy brass and factory loads for, although it is more efficent, as far as powder burn. I just recently inherited a 270 Gibbs but have yet to play with it.