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.338 WM. Shoot the 225 gr. accubonds and it will knock elk flat at 500 yds. Has way more energy and retains way more velocity than the 7 mag. It is an elk killing rifle, and is a great long range deer gun.
Definitely a 7 mag. If you want to kill deer at 500 yards it's your huckleberry. And it will drop elk like a bad habit with the 168 gr Berger vlds.