Suppressors pressure at the muzzle; quickload data?

[logic factory]

i have not seen enough data to be able to accept the numbers i have seen. it seems like quickload is the software people have goten their data from. could anyone link a thread or share some of their own data? please include as much pertinent information on the combination for the particular muzzle pressures you can.

is there a crude correlation between chamber and muzzle pressure to estimate within a couple 1000psi?

because it is difficult for me to locate such data maybe this could become and archive of sorts for others seeking similar questions?

the specific muzzle pressure i am looking for is a 300 blackout 16.5" barrel 1/8 twist shooting subsonic 220-240 bullets.

 

[bronson90]

Re: pressure at the muzzle; quickload data?

What are you trying to do and maybe your question will make a little more sense...

 

[ddavis]

Re: pressure at the muzzle; quickload data?

Probably to better understand the pressure that a suppressor will be exposed to. 9mm suppressors are generally considered ok for subsonic 300 BLK, but then again it is a bit higher pressure than a 9mm.

I went through something similar when trying to understand why my Shooter's Depot carbon fiber can could not handle the pressure from supersonic 300 BLK out of a 10" barrel and wanted to determine how it compared to a normal length 308 barrel, which the suppressor was rated for. It turns out the pressure was in fact quite a bit lower in the 300 BLK, but the suppressor was just a POS. Someone with Quickload could definitely answer your question as they did for me.

 

[bronson90]

Re: pressure at the muzzle; quickload data?

I run a SWR Trident-9 on my 300BLK and with both 10" & 16" Noveske uppers without any issues...

 

[logic factory]

Re: pressure at the muzzle; quickload data?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bronson90</div><div class="ubbcode-body">.</div></div>
sorry, i was trying to ask the questions a little less selfish in an effort to generate data for others as well.

the goal is to have an idea of what muzzle pressure an 16.5" aac blackout with 220 grain leaving muzzle at 1070fps would generate. after acquiring this data and trying to collaborate it, i would then run some simulations with the software i use to create the suppressor.

i have located a post where it mentions chamber pressures of 39kpsi than mentions it should be about 2-4kpsi at muzzle.

i also located a source with several hand gun calibers, barrel lengths, and loads with the muzzle pressures ranging from ~900kpsi to ~4400kpsi.

 

[logic factory]

Re: pressure at the muzzle; quickload data?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ddavis</div><div class="ubbcode-body">.</div></div>
what i have read, it appears that the muzzle pressure increases proportionally to decreased barrel length. so maybe the suppressor was marginal for 308 out a 22" barrel but the 10" blackout was too much?

what results did you see that suggested the suppressor was not up to the task? so i can maybe have a better idea of what to look out for.

i had read that slight correlation between 9mm and subsonic blackout too. that is why i saved that source i mentioned above; i.e. ~ 4500kpis muzzle pressure.

thank you for sharing your experiences.

 

[logic factory]

Re: pressure at the muzzle; quickload data?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bronson90</div><div class="ubbcode-body">I run a SWR Trident-9 on my 300BLK and with both 10" & 16" Noveske uppers without any issues... </div></div>
i will try to find some specific data on this suppressor so that meaningful conclusions can be drawn; i.e. material thickness, geometry and metallurgy.

 

[ddavis]

Re: pressure at the muzzle; quickload data?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: logic factory</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bronson90</div><div class="ubbcode-body">I run a SWR Trident-9 on my 300BLK and with both 10" & 16" Noveske uppers without any issues... </div></div>
i will try to find some specific data on this suppressor so that meaningful conclusions can be drawn; i.e. material thickness, geometry and metallurgy. </div></div>

http://www.quarterbore.net/forums/showthread.php?t=4691&highlight=muzzle+pressure

That's the thread in which I asked a similar question and got answers a while back. The thing that led me to believe there was too much pressure was:

A. The internals rattling loosely.
B. The blast baffle bent.
C. The suppressor blowing up and shooting 30 yards downrange.

None of this had anything to do with the BLK having too much pressure, it had to do with a shitty manufactured can from a horrible company. Just don't use carbon fiber and you will be fine.

-Dan

 

[logic factory]

Re: pressure at the muzzle; quickload data?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ddavis</div><div class="ubbcode-body">.</div></div>
dan,
thank you for the link as it provided more data for muzzle pressure.
the rough correlation was chamber pressure 56kpsi to 7.6kpsi at muzzle with change in coal. the other data was 46kpsi to 7.8kpsi with an undisclosed coal. velocity was about 85fps higher on the load that had higher chamber pressure but reduced muzzle pressure.

thank you for sharing your negative experience; i can imagine it is a memory you would like to bury.
- dave