Hello, I am new to the board and would like to ask for opinions on a couple calibers, but first a little background history about me and what I want from a rifle. We do quite a bit of long range shooting in the off season and some long range hunting as well. We have been taking a trip out west every year since 1994. We usually hunt antelope and mule deer with the emphasis being to make long range shots. We use the following calibers right now: 25/06, 7mm rem. mag., 7mm STW, .300 win. mag, and a .300 RUM. The ultra mag is the only one we have yet to take something way out there with. By way out there, I am talking from 500 to 1000+ yards. My longest kill to date is 1098 yards on a mule deer with the STW. Now on to the questions! Accuracy is not the problem, provided the wind is calm, ENERGY IS! I am looking for a caliber that will have enough energy to CLEANLY harvest game at 1000 yards. my initial ideas are either a .338 RUM or a .375 RUM. in a fluted satinless sendero. Lets hear what you think!