PC A silenced 9 mm appears to be louder than a crossbow

Oh my bad I misunderstood your statement, I re-read it. Yeah nevermind those videos do not address any of that. Now I am curious and I'll look in to it because now I want to know. If I find an answer I'll post an update.
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No worries :) From some skimming I think it's going to wind up being a fairly deep fluid dynamics problem, without a simple equation.

But a maybe(?) fair short version is that the main contributer to the overall energy is the frontal area, _not_ the speed. So my perceptions my be totally wrong on the diff between a .22 & a 5.56...

<won't be the first time... -I- thought the dress, did indeed, make her butt look big... :behindsofa: >

 
hmm, I watched them both... First one went into how the angle of the wave front could be used to calaculate the Mach number, which is very cool, but I don't recall them talking about the energy levels or how they related to the sound pressure?
I mean, no question it makes sense that the larger and faster an object is that breaks the sound barrier, the louder the sonic boom will be, I just can't point a finger at an equation that would show the .22 LR's boom as X dB and the 5.56 as x% more.
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I've seen those 2 videos in the past as well and like you said, it didn't answer any sound questions I had. But ya, that's exactly what I'm wondering now. If a jet makes a loud enough boom to pop windows and stuff and a bullet cannot even at 1cm away... what exactly is the equation for sound dB? I assume weight doesn't matter and length of the object doesn't matter either, my only guess would be the size of the tip causing air redirection. So I wonder if the tip of a bullet makes a big difference when it comes to sound? Cuz there's flat tips (which is the ammo I usually create for my .308), and there's also pointed tips (usually copper coated). I've also seen experimental bullets fly sideways (due to bad aerodynamics), I imagine the sound for that would be different too. Personally, when I fire them both off, they sound the same to me, but maybe at a distance, there's a difference? Anyone dumb enough to stand downrange... for science? lol

 
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I'd likely ask the question: Were you in stealth at the time? Because a silencer is not a really strong gaurantee.

I've been a strong crossbow user in the past and I've had zero issues killing sleepers so long as the bolt connects to the head.

Also, I've had better luck with the vanilla wooden bow than I've had with the crossbow.

Now, shots hitting any other portion of the body, or walls, glass, etc etc is another matter. Corners of things can also block shots even if

you think you have a clear aim. I can count on many hands the number of times I thought I got a head shot, only to find the

arrow OR bolt is stuck in an invisible hit box of a countertop or a dresser. It's very frustrating.

Also, if you have loud teammates they tend to ruin the ninja's A-Game without any doubt. But, that's an interpersonal issue, not really a gameplay one.

 
Honestly with silencer/suppressors I don't care about reality, I would prefer to be able to kill 10 zeds in 5 seconds without make any sound. I love playing with guns in Far Cry for example and would love to be able to do the same here. The problem with guns now is, if you use them you can get overrun quickly.

I remember some times, when I played 7d2d and just head shot every sleeper with a crossbow and I was fine. I would really love to be able (in mid or even only in late game) to kill sleepers with the 9mm and a suppressor with out being noticed.

 
With advanced muffled connectors on each piece of armor and full stealth perks (hide in shadows), I've be able to use the silenced pistol without waking any z's, even when a few feet from to them. I think the sound meter read low 30s, iirc. The silenced marksman's rifle is another story. Much better for taking out the stronger rads, but easier to wake when close to another. I generally try to shoot far from another z when using that one. The sound meter registered mid 40s, iirc.

 
Fox, see ZombieSurvivors link in his Edit. There are sound files of bullets passing by downrange :)

They triggered a memory of a training course I went through in the military; live fire M60s (7.62) shooting over our heads as we navigated an obstacle course. At night, in the rain, of course... At the beginning of the course there was a ~15 foot high embankment that led up to the course with all the 'junk'; culvert tubes, razor-wire, pits, etc. We were all stacked up at the base of the wall, then the trainers started up the sirens, boomers, M60s, etc., then the "GO!!". But I remember hearing the bullets zinging by overhead and thinking, "oh ♥♥♥♥! those bastards weren't kidding, this -is- live-fire!". Once you were up onto the course itself the bullet sounds weren't as easy to identify, due to all the other sounds, and the muzzle blasts of the M60s.

And I recall using a snow shovel to clean up all the brass inside the M60 towers. Thousands and thousands of rounds fired. No idea if they still do this now a days, been a few decades, heh :)

nodOn, I agree with you actually. One of the reasons I keep hoping for a .45 ACP pistol to be added. Since the 'normal' .45 ACP round is well under ~1100 fps there isn't a supersonic crack to help wake the zeds.

Though it shouldn't be too hard to make a modlet to add in sub-sonic rounds for both the 9mm & 7.62 rounds.

If the modlet kept to 'rl' then both rounds would wind up being about the same in 'power'. Which wouldn't be a big deal with the 'sneak shot' bonus, but would sure be felt by the Marksman rifle in a non-stealth fight; so we'd get good quick at swapping out ammo types :)

 
Also consider this: Sneaking and trying to be a ninja without an actual ninja build, is not going to yield the results some look for. If you enter a house on day one with your newbie bow while in stealth there could be issues. With proper perks and gear, you'll see a dramatic difference.

 
at 15:17 is probably one of the funniest videos I've ever seen about suppressed firearms. It's a 300 blackout bolt action with a fancy suppressor. The loudest things you hear when he fires is the action/firing pin and then the distant sound of the bullet impact. Even with subsonic ammunition and a good suppressor you'll get some bang if you're using a firearm that uses exhaust gases to cycle the weapon.
 
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Stand down range, about a half a mile away should do it, at a rifle being fired towards your direction. You hear are very loud crack and followed moments later by the gun being fired, the faster the round goes, the louder the little sonic boom. It almost sounded like some firing a .22 rifle next to you.

 
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