I have finally 100% decided to build me a .264, and I am wondering from some here, what the optimum barrel length needs to be on one of these to get a full powder burn. I am also looking to mainly shoot 120-140gr bullets, but may shoot a 160 every now and then. That being the case, what twist would be best for this scenario? My reason for the .264, is I already have a .243, .257 Roberts, a custom 270, and a 300 WM. I just want something to fill in the gap betweent he .257 and .270, and something flat shooting with a bit of umph!