Darryl has already given me some advice but I thought maybe the rest of you could offer an opinion. This spring I will be building a 338 caliber, heavy rifle for ultra long range hunting. My goal is to achieve a MINIMUM of 3,100 fps. with the 300 MK. I want to use a beltless case and do not want to fireform. As far as I know, this limits me to the 338 Ultra mag, 338 lapua, and 338 Excalibur. I know the Excalibur would give me the performance but it's an exotic and brass may be hard to come by. I am leaning towards the Lapua but want to make sure I could get the velocity without too much trouble. I will use a barrel of 36 to 38 inches long and a Hall action. Any input would be appreciated.