Why is my XDm 9mm 4.5" LOUDER than my AR15?

desibaba

New member
I have a MP15 Sport 2 and a 9mm XDm 4.5 inch. I shot both back to back at the range and I realized the pistol seems LOUDER than the ar15. Also the sound of the 9mm is more like a balloon filling up completely with air and then "Popping" vs the lower "Bang" sound that the AR makes. What causes these differences? Sorry for the dumb newbie question but I was curious.
 
Are rifle and pistol using the same range? This is not the case in most places where I've shot.

If they are different ranges, are there dividers in between the pistol lanes? Baffles? Nearby buildings?

As discussed in numerous past threads, gunshot noise sometimes propagates in strange ways, particularly when nearby structures can reflect sound back towards the firing line. Another observation is that AR's with muzzle brakes or certain types of flash hiders seem oddly quiet from the shooter's perspective but are HOLY WHOA DANG LOUD sitting at the next lane over. :eek:
 
Im no expert, but I find that the shorter the barrel, the louder the noise. If you've ever shot a .22mag heritage revolver, you know what Im talking about. My ears would ring for days after shooting that thing, even just a few rounds. Take a remmingtin 870 and compare the noise, huge change in noise although I guess it cpuld be the size of the bullet? . Like I said, Im no expert but Im sure someone who is will weigh in on this. You've peaked my interest, though.
 
It's NOT the barrel length.

At least, not directly. The single biggest factor ( I think) is where the muzzle is, in relationship to your ear.

The bore size, amount of powder burned, pressure, and muzzle attachments also matter, but, I think, not quite as much.

With both held in the normal shooting position, the usual rifle/carbine muxxle is going to be a foot or more further away from your face (and ears). If you don't think this makes a difference, stand close, and roughly in line with the muzzle of each (and off to the side), when fired, and judge for yourself.

(ALWAYS WEAR HEARING PROTECTION!!!!)
 
I don't know if I totally agree,44 AMP. A .22 pistol held in a shooting stance is a lot louder than, say, a short barreled 10/22 held at a shooting stance. The muzzle would be roughly the same distance from the shooter. Just my opinion, and you know how that goes.:rolleyes:

Should be easy to prove one way or the other with a couple of same caliber guns with greatly different barrel lengths and a decibel meter held at the same distance from both muzzles.
 
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