Well I got a ultra mag too but it is the .338 just a tad bigger!. I love it people says it kicks but i think a 12 guage slug gun still kicks more than it does. both the 300 and 338 have a few rounds if you reload you can get a more divirse setup. I would use the 180 grain it will be very effecient on elk and long range deer congrats on the new gun! A guy can not have to many!