I think velocity has a bit to do with it, up close if doing warp 9 I have heard they can be a little explody, personally haven't had that issue as the only animals I've shot close were shot in the head, where even a fmj would've done the job.
I'm about to trial the 178gn eldx in my 308, have heard good things about them. Currently running 168gn eldm's and they aso seem to work pretty well.
I think heavy for caliber mitigates the impact velocity at close range whilst still carrying ample energy and velocity for longer range shots.
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