Suppressors Suppressor affect on pressure / velocity

[Kyskeet]

new to suppressor so, do they affect chamber pressure / velocity in bolt action rifles

 

[Conrad]

Yes, they will put a little more back pressure on the chamber. If the load is already hot you may have to drop a couple tenths of grains of powder to keep bolt from getting sticky. Some will report a small increase in velocity.

 

[Zak Smith]

Peak chamber pressure happens way before anything is presented to the can

 

[308Gunner]

Listen to the man ^^^^^^^^^^^^^^^^^^^^^^^^^^^

 

[surgeon260]

Zak, is there any science to a suppressor affecting velocity?

 

[Zak Smith]

I forgot to add, that is it possible for a suppressor to increase pressure in a roundabout way, if the additional carbon dusting or accumulation makes an already tight neck or throat all of a sudden "too tight", you'll get a pressure increase from that. In my experience, that is very rare.

 

[Zak Smith]

Sure, there is more pressure behind the bullet inside the can (the gas trying to escape forward through the baffle system) than there would be if if were just open to atmosphere. Our computer models are very close to what we see experimentally.

 

[hollowoutadime]

My experience with a AI/AT .26" bbl 260rem is around 5fps increase using hand loads and a Magnetospeed V3. Frankly very small, withing the SD. This could have been a warmer barrel on vs off.
Only tested probably a dozen groups/loads off vs on. Almost always shoot suppressed.

 

[Kyskeet]

Zak, thanks for the info, I was thinking the can was NOT going to affect chamber pressure or speed but the knowledge base here is to tempting not to verify

 

[Yondering]

I forgot to add, that is it possible for a suppressor to increase pressure in a roundabout way, if the additional carbon dusting or accumulation makes an already tight neck or throat all of a sudden "too tight", you'll get a pressure increase from that. In my experience, that is very rare.

One other thing to add is they can cause false pressure signs in gas-operated semi autos, even though as you said they don't raise chamber pressure. Unlocking the bolt too early in an already overgassed rifle (as many ARs are) can often cause swipes, which some people interpret as pressure signs. I suspect that is the source of the myth that suppressors raise pressure.