Suppressing 40 cal

General silencer discussion. If you want to talk about a specific silenced rifle or pistol, it is best to do that in the rifle or pistol section for that brand.

All NFA laws apply.

Moderators: mpallett, mr fixit, bakerjw, renegade

Post Reply
wmdaniel70
Senior Silent Operator
Posts: 148
Joined: Wed Mar 16, 2011 11:18 pm

Suppressing 40 cal

Post by wmdaniel70 »

I have always heard that suppressing 40cal is inherently hard, that both 9mm and 45acp suppress much better. I have a TiRant45 and I think 45 actually sounds a LITTLE quieter than 40 through it. Why is this? Would a dedicated 40 can (Osprey, YHM Sidewinder) do a better job? Just my curiosity working! Thanks.
rimshaker
Silent But Deadly
Posts: 1038
Joined: Mon Jul 23, 2012 10:15 am
Location: FL

Re: Suppressing 40 cal

Post by rimshaker »

Couple of factors in play. The muzzle pressure for 45acp is actually lower than 40. Same thing for their chamber pressures and energy outputs.

And the bore aperture in the Tirant is designed for 45. But when the smaller 40 passes through, a larger than necessary bore usually means increased sound signature.

Suppressing 40 is still fun if you stick with the subsonic 180gr rounds.
User avatar
T-Rex
Silent But Deadly
Posts: 1865
Joined: Wed Oct 29, 2014 3:38 pm
Location: CT - The AntiConstitution State

Re: Suppressing 40 cal

Post by T-Rex »

I have no issues whatsoever with the performance of my Octane45 on a Glock23.
The Tirant and Octane are 2 different animals so I'm not comparing them, but it does relate to your query.
Rimshaker has some good points as well.
Completed Builds www.silencertalk.com/forum/viewtopic.php?t=79895
Burst Calculator www.engineersedge.com/calculators/pipe_bust_calc.htm
Silencer Porn www.instagram.com/explore/tags/silencerporn/
mbogo
Silent But Deadly
Posts: 412
Joined: Wed Feb 22, 2012 1:40 pm
Location: San Antonio, TX

Re: Suppressing 40 cal

Post by mbogo »

My Osprey 45 works just fine on my Glock 23. I use the 180gr. bullets when shooting suppressed.

mbogo
7 stamps and 1 in jail :mrgreen:
User avatar
Garrett
Silent But Deadly
Posts: 640
Joined: Thu Oct 12, 2006 8:34 pm
Location: Western Michigan

Re: Suppressing 40 cal

Post by Garrett »

rimshaker wrote: And the bore aperture in the Tirant is designed for 45. But when the smaller 40 passes through, a larger than necessary bore usually means increased sound signature.
But when you shoot a 9mm through that same .45-sized aperture, it's quieter than either the .40 or .45 ammo.
rimshaker
Silent But Deadly
Posts: 1038
Joined: Mon Jul 23, 2012 10:15 am
Location: FL

Re: Suppressing 40 cal

Post by rimshaker »

Garrett wrote:
rimshaker wrote: And the bore aperture in the Tirant is designed for 45. But when the smaller 40 passes through, a larger than necessary bore usually means increased sound signature.
But when you shoot a 9mm through that same .45-sized aperture, it's quieter than either the .40 or .45 ammo.
9mm has much lower muzzle pressure though. Overall sound signature is the combination of several factors working in tandem.
User avatar
Garrett
Silent But Deadly
Posts: 640
Joined: Thu Oct 12, 2006 8:34 pm
Location: Western Michigan

Re: Suppressing 40 cal

Post by Garrett »

rimshaker wrote:
9mm has much lower muzzle pressure though. Overall sound signature is the combination of several factors working in tandem.
Agreed.

I don't think I've shot them back to back, but I have both .40 and .45 barrels for my Uzi. But my impression is that .45 sounds louder than .40 (or 9mm), when shot through the same .45 can.
User avatar
MJF1911
Silent But Deadly
Posts: 523
Joined: Mon Sep 26, 2011 11:40 pm
Location: Montana Territory

Re: Suppressing 40 cal

Post by MJF1911 »

I don't know about the Ti Rant, but in testing with the Osprey and Octane 9 < 40 < 45.
SWR 556 Specwar, 762 Specwar, Octane 45HD, Spectre II; SilencerCo Osprey 45, Omega; AAC Pilot, 300TM; Ruger AC556
Rugged Oculus; Dead Air Sandman K
User avatar
RPM509
Senior Silent Operator
Posts: 145
Joined: Fri May 06, 2011 8:54 pm
Location: 66048

Re: Suppressing 40 cal

Post by RPM509 »

Just by ear, my Ti-Rant 45M in the long config 45 < 9 < 40 shooting 230, 147 and 180 gr respectively from a Glock 23 with conversion barrel for the 9, stock for the 40 and
on a Kimber Ultra Carry II with a aftermarket barrel. All are pleasant to shoot to my ear using sub-sonic loads. I am actually surprised at how nice the 9mm is out of the 45 cal hole.
"a butt tuba" - Palindrome
hardcase
Silent But Deadly
Posts: 449
Joined: Sun May 26, 2013 9:01 pm

Re: Suppressing 40 cal

Post by hardcase »

I have a Yankee Hill Cobra in .40 cal. Shooting 9 mm vs .40 through the same can, I cannot really tell much difference, other factors being equal in my handloads. Powder and fps seem to make a bigger difference than caliber. Definite difference if one or the other goes super-sonic.
Post Reply