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We rate our AR550 steel for the same distances as our AR500. AR550 is significantly harder, and mitigates the ‘pitting’ effect better than AR500. This is especially noticeable with higher velocity rounds, such as .223/5.556 NATO. For more information, check out our article “AR500 Vs. AR550. What’s the Difference?”. There’s a video testing it out there as well, with a side-by-side comparison!