I've been using the .280 Rem., for 40 years on many game animals, and I have killed one elk with it. (My regular elk rifle is a .338.) I used my handload of 160 gr. Nosler Partition bullet, 54 grs. IMR 4350, CCI L.R. primers. Chronographed at 2872 FPS. (Oddly enough, the .280 was my backup rifle, and when the scope failed -- broken reticle --on my .338, I used my old tried-'n-true .280, very successfully.)
I know that isn't for a .284, but I suggest for elk, the 150 gr. Nosler Partiton bullet, or, if the .284 case neck is long enough to hold the bullet tightly, try the 160 gr. Nosler Partition.
Either of those bullets, placed in the right spot on a bull elk, will put meat in your freezer.
Good luck. J.B.
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