Poor performance can happen with any bullet, but in this day and age it doesn't make any sense to be using 55gr bullets in a .223 with a fast twist barrel. The heavier 70-80gr bullets work a lot better if you select an appropriate option.
Also, shot the first spring deer with the .223 the other day after hibernating for winter, big fat red hind at 230m, shoulder shot with 80gr ELDM, wobbled a couple of steps and died.
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