270, 30-06,308, 7x57, 280, 7mm Mag or STW one of the 3900 mags. All will work if you do your part. All have killed many an elk and bigger game. The obsolete 8 MM Rem Mag was a good one as well. I used a 338 for several years and itwhile it did the job, I was never impressed with it. Finally sold my last one a few years back. It wouldn't do much that the 300 mag would not do.