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So to answer the OP depending on the projectile and shooter you should be comfy at 300m. Personally I would run the 168eldm and 2208 because of the slower speed and bullet construction you should be...

I wouldn't trust the eldx below 1900fps but the eldm is supposed to be good to 1400fps. I run eldms at 2730 and have run them around the same speed in another calibre and have shot small fallow up...