I have drawn a tag for a New Mexico Oryx hunt on the White Sands Missille Range in February, 2012. I have a Remington 700 BDL .270 with which I am very comfortable. I intend to use 150 gr Swift A Frame bullets loaded to about 2700+ fps. My gun consistently shoots 1 in. hundred yard groups, and this load, sighted in 2 inches high at 100 yards shoots abut 4 inches low at 300 yards. Official information from the WSMR advises .30 caliber or larger. I know this load is quite adequate for elk, but they say the Oryx is tougher to bring down. Can anybody give me any truly sound reason why I should not use the .270 I am comfortable with for this hunt?