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Not surprising at all. Shotgun's are actually pretty easy to stop. I use AR500 for steel targets and have thousands of 5.56, 7.62, 300WM 338LM rounds on them.
Speed is one of the main killers for steel. Mild Carbon steel will stop shotguns & pistols. A 17HRM will really divot AR500 due to the speed. My 7mm Rem Mag and 6mm Creedmoor are pretty bad @ 100 yards but not @ 200 yrs.
I think someone did some tests with AR500 plates with a 16" barreled AR and got penetration @ 10yrds. The 10.5" AR barrel would not penetrate. Same round, just less velocity.
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