While ammunition is becoming more widely available, there is nowhere near the selection and availability as there is for .223 Rem or 5.56x45mm. They are very loud even suppressed. For those with a suppressor, the American Eagle 220g will provide a heavy projectile that when suppressed, is easy on the ears, which is important for close quarters that one may encounter in a home defense situation. .45 ACP suppressed is around 135 dB. From the numbers I have seen, .300 BLK gets you down to around 120 dB. Shooting them without a suppressor seems kind of pointless. Supersonic .300 Blackout does nothing that supersonic 5.56mm, 7.62x39mm, 6.8mm, or 5.45mm can’t do and subsonic .300 Blackout is a poor choice for defense. But they’re pretty loud. You still get a pop out of the ejection port and the action itself isn’t silent, but hearing protection isn’t needed. As much as I love the quiet bliss of subsonic 300 Blackout in a suppressed carbine, given the choice, I’d still pick a supersonic round for a defensive situation. We did some quick-and-dirty metering just to give us an idea of how it would suppress using the AAC 762-SDN-6 suppressor. With a reasonable barrel length (10” or so) and suppressor out of an AR, subsonics are pretty quiet. Yes, I know these numbers can and do vary with suppressor type used and if they are low back pressure or if measuring at the shooter's ear or measuring elsewhere. 9mm suppressed is around 125-126 dB. Ever since I visited the Advanced Armament guys in 2011, I knew that I needed to get my hands on a suppressed 300 BLK SBR. They showed me the light, and turned me into a massive 300 BLK fanboy – you may have noticed. 300 Blackout offers a range of performance, in both supersonic and subsonic loadings. Regardless, when it comes to shooting suppressed - the .300 BLK was an absolute blast! I can't compare with a 5.56 pistol because I don't have one, but I'm pretty sure the energy numbers are higher out of the short barrel 300. I know dB system, but I don't have a lot of experience with 100 dB vs 110 dB or 40 vs 100db. In short, I’ll sacrifice ultimate sound suppression for nearly twice the muzzle velocity and energy all day and twice on Sundays. Without a suppressor, the folks at Silencer Shop have established baseline measurements of 208 and 220-grain subsonic 300 Blackout loads from a 9-inch barrel in the 157 to 162-decibel range. The supersonic rounds, that are built for short barrel 300 Blackout, do not penetrate the target and expend all their energy and do a ton of damage. Ideally, we’d all have suppressed 300 Blackout rifles built with eight to eleven inch barrels. I’ve just put the finishing touches on my new favorite rifle of all time and I wanted to share my excitement with you all. We wouldn’t have pay a $200 tax stamp for the silencer and another $200 tax stamp for our Short Barreled Rifle (SBR). Assume the factory suppression numbers are accurate, and that puts the overall sound pressure figures in the 130 dB range when shooting subsonic. For context, a police car siren is about 120 dB, an alarm clock about 80 dB, and a car horn around 110 dB. With the addition of a 300 AAC Blackout barreled upper receiver and a .22 LR adapter kit, the combat-proven .223-caliber AR-15 rifle platform equipped with a quick-detachable .30-caliber suppressor is the only weapon with the versatility to use all three cartridges from the same gun. If possible can you relate to real world noise levels. This is definitely on my short list of "most fun rounds to suppress". A .22LR (unsupressed) is much louder. 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