16" Barrel for a 22lr a bad idea?

[Andouille]

Supers on the other hand, I have to imagine the longer the barrel the quieter it will he simply due to distance from the ear

longer barrels dissipate energy better than shorter ones as more propellant is burned and gas pressure reduces, consequently the muzzle blast is lessened with increasing length. This is why many lightweight rifle suppressors are not rated to handle the blast from shorter barrels.

I find that my 4" pistol is substantially louder than my 16" rifle with either subs or supersonic rounds. Barely need a suppressor on the rifle with the slowest subs.

 

[Shortschaf]

longer barrels dissipate energy better than shorter ones as more propellant is turned and gas pressure reduces, consequently the muzzle blast is lessened with increasing length. This is why many lightweight rifle suppressors are not rated to handle the blast from shorter barrels.

I was talking about supersonic 22 loads in a suppressed host, short vs long. I dont think unburned powder has anything to do with it.

If it did, a shorty sub would be louder than a long barreled sub, and that is not the case.

 

[Andouille]

I was talking about supersonic 22 loads in a suppressed host, short vs long. I dont think unburned powder has anything to do with it.

If it did, a shorty sub would be louder than a long barreled sub, and that is not the case.

In a 22lr, probably not unless running a 2" barrel, but gas pressure still reduces at the muzzle with increasing barrel length, even after all propellant is burned, and regardless of sub or supersonic bullet speed. Less pressure and lower "uncorking" force means less sound. This is also why shorter barrels have a larger muzzle blast flame, and cause more baffle erosion in suppressors than longer barrels. More pressure = more energy = more sound.

Here's a more detailed explanation, and even a formula to calculate the effects of barrel length on muzzle pressure: https://silencerco.com/blog/muzzle-pressure-chamber-pressure-whats-the-difference/

 

[DoubleDown]

Tax stamps free in few days, chop to 12.5”