6.5 BR: I have no experience w/elk but I use 270/130 Core Lokts for whitetail, 100-200 lbs. Over the years I have observed they are a little tougher than Hornady ils, WHICH I USE. The Core Lokts work fine but the expansion is a little less than Hornady. (same cal. & wt)
That said, the Core Lokt should be PERFECTLY FINE on elk.
JWALL
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There's a 260 Rem in every 270 Win > GRIN