Is your HD rifle suppressed or is ear protection the plan or both? Poll.

[mig1nc]

I had to look it up.

It's a hunting bullet meant for 2500 fps + velocity.

At .300 BLK speeds, probably SS as well as Sub, it's going to make a smaller wound than 115 gr 9mm FMJ and penetrate far more building material. I don't understand why one would choose this.

Discreet Ballistics and a few others make projectiles specifically optimized for 300blk at sub velocity.

I'm more a supers kind of guy though.


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[flenna]

I had a lot of time in a shoot house when I was with the PD- shooting MP5s, 12 gauge pumps, .45 pistols and AR15s. I can say that the 5.56 was abusive to shoot (we didn’t have suppressors) in small rooms although all the others were but not as bad. The MP5s seemed to be the less concussive than the others. I have a YHM Fatcat in jail that is going on my HD gun- the shorter overall length seems to lend itself well to shorter barrels.

[tangolima]

Sounds like .300bo subsonic is good choice. I am tempted to give a try.

-TL

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[PeteMe]

I have shot ARs in enclosed spaces with no hearing pro a few times and suppressed ARs in enclosed spaces quite a few times. A decent can on a 5.56mm AR makes a tremendous difference for hearing. While it may not be technically hearing safe it’s not that far relative to no can at all. Suppressed 9mm (PCC or pistol) with defensive subsonic JHP rounds is not silent but not loud. You can easily have a conversation while firing it in an enclosed space. With quiet subsonic 9mm, they are essentially silent. Supersonic suppressed 9mm is loud but tolerable relative to no can. I have an unsuppressed 9mm pistol in the bedroom for HD. If times get spicy it will be an SBR AR 5.56 suppressed or SBR PCC 9mm suppressed. Wouldn’t worry about hearing pro for emergency use with those.

[SteyrAUG]

I had a lot of time in a shoot house when I was with the PD- shooting MP5s, 12 gauge pumps, .45 pistols and AR15s. I can say that the 5.56 was abusive to shoot (we didn’t have suppressors) in small rooms although all the others were but not as bad. The MP5s seemed to be the less concussive than the others. I have a YHM Fatcat in jail that is going on my HD gun- the shorter overall length seems to lend itself well to shorter barrels.

There is also something about full auto (assuming you are using select fire) where the impulses of individual shots seem lessened depending on rate of fire.

[1168]

I have shot ARs in enclosed spaces with no hearing pro a few times and suppressed ARs in enclosed spaces quite a few times. A decent can on a 5.56mm AR makes a tremendous difference for hearing. While it may not be technically hearing safe it’s not that far relative to no can at all. Suppressed 9mm (PCC or pistol) with defensive subsonic JHP rounds is not silent but not loud. You can easily have a conversation while firing it in an enclosed space. With quiet subsonic 9mm, they are essentially silent. Supersonic suppressed 9mm is loud but tolerable relative to no can. I have an unsuppressed 9mm pistol in the bedroom for HD. If times get spicy it will be an SBR AR 5.56 suppressed or SBR PCC 9mm suppressed. Wouldn’t worry about hearing pro for emergency use with those.

Yeah, suppressed 9mm carbine/SMG with 147gr is awesome in a shoothouse. With ears of course. But it facilitates on-the-spot discussion.

[Disciple]

3dB is 40% increase in pressure, not double, I'm afraid. It is 20*log() kind of deal. 6dB to double pressure.

True, but NIOSH recommended exposure limit is predicated on hearing loss from constant noise being proportional to sound power, not pressure, which means 3 dB represents a doubling of exposure if the predicate holds for impulse noise.