This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.
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For the purposes of this conversation 5.7x28 doesn't actually count as a milder round since it leaves the muzzle at well beyond supersonic velocities.
In answer to your question though, yes... It still works since what suppressors fundamentally do is slow down cool and mix the propellant gases with a volume of ambient air both reducing the peak decibel levels produced and spreading the crack out over a longer period of time.
As far as how much, to what degree, and from what distance you'll be fully masked that's going to vary depending on everything from the terrain and etc around the point you're shooting from, the terrain and surroundings the person you're shooting at is in, the surroundings and terrain between both points, the specific suppressor and round combination, the general power level of what caliber you're using, and probably a bunch of other factors I haven't listed or thought of here up to and including whether or not the person you're shooting at cleans their ears regularly or not.
Something like this isn't binary yes/no statblock friendly when you're talking about the sound side of this equation.
However, the suppressor swallowing up the muzzle flash and whatever the sound reduction winds up being is still going to put you in a better position than using a rifle with no can.
There is one place even that may not hold true though. Due to the proliferation of cheap cheerful and passably good thermal imaging systems may occasionally make it so, especially at night, if you've been firing a whole bunch the can on the end of you're gun may make the origin point of your firing much EASIER to find.
Like everything though, universal suppressor issue is a trade-off.
In nearly all realistic situations Though it's going to convey upon you dozens or hundreds of advantageous things for every one time it is suboptimal. So in the scope of combat innovations and force multipliers it's more or less an unqualified no downsides situation.
I mentioned 5.7 as an example but really i meant if u change the overall power levels. For example if u went from 762 down to 556 would it further mask your location.
Due to there being less shockwave? Likewise, i know 5.7 is supersonic but surely it has less shockwave and thus it masks you better.
Are you referring to the supersonic shockwave from the bullet passing or the muzzle blast?
Both. I mean tge overall sound signature.
Anyway on a random note, would suppresaors work with sabot or flechette rounds? Or would it affect sabot separation and accuracy.
I know the AAI rifle had a semi suppressor because it was so loud
That depends heavily on both the sabot and suppressor design.
That said, yes you can absolutely make a suppressor that supports sabots quite well. You do that by making a pepperpot style liner for your suppressor.