Please feel free to correct me if I'm wrong, but I believe a high impact sniper rifle is a one-hit kill with a headshot to a Stormcaller.
I've always taken down a Stormcaller with a headshot from my 1000 Yard Stare every time.
Sometimes I've heard them activate it and I just wait for them around a corner and I've been able to take them out with one shot without them taking damage from any other source.
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High-impact, maybe. I dunno