Suppressors Question, on pressure

[Rutter]

Just got my first can in a couple a days ago. As I was talking with one guy he is telling me that I may need to work up a different load, as the can will cause more pressure. How much more pressure can I expect? What is the average percentage that you guys have had to lower your powder charge to run a can? Any help or positive information would be appreciated.

 

[SupressYourself]

I'd be interested to hear this "one guy" explain the physics behind that. Pretty sure it's not a thing.

However, it will change barrel harmonics, which may or may not affect the consistency of your current load.

 

[Rutter]

Just didn’t want to go out and blow myself up on the first day of fun.

 

[samson7x]

I've never lowered powder charge with can on vs. off.

 

[Huskydriver]

Yea "that guy" is full of it. You may see a slight increase in speed due to some effects of the gases inside the can but it's pretty minimal if you do. I'm +10 fps can on vs can off with the same load.

 

[Mordamer]

This myth comes from suppressors being used on AR-15's and AR-10's that were probably already overgassed before the suppressor was installed. Adding the suppressor increases back pressure and can make the bolt unlock faster. This can appear to be higher pressure and leaves marks on the brass similar to high pressure from a hot load. In reality the bolt is unlocking before the chamber pressure is reduced to a safe amount. This can be remedied in several ways. On a bolt gun there will be no such symptoms.

 

[WeiserBucks]

I've never used a can on a gas gun , but I've used mine on magnum bolt rifles a ton . I use the exact same loads that I developed prior to owning a suppressor. No increase in pressure at all , but both my rifles gained 20 fps and lowered ES a bit .

 

[Zak Smith]

The only way pressure may increase with a bolt gun is if your neck/throat is already tight and the additional carbon fouling makes it even tighter. Extremely rare.

 

[Rutter]

I've never used a can on a gas gun , but I've used mine on magnum bolt rifles a ton . I use the exact same loads that I developed prior to owning a suppressor. No increase in pressure at all , but both my rifles gained 20 fps and lowered ES a bit .

If that happens for me I’ll be very pleased.

 

[Jimgal62]

Just got my first can in a couple a days ago. As I was talking with one guy he is telling me that I may need to work up a different load, as the can will cause more pressure. How much more pressure can I expect? What is the average percentage that you guys have had to lower your powder charge to run a can? Any help or positive information would be appreciated.

I get about 25 FPS increase using my TB cans.

 

[Long Range 338]

The only way pressure may increase with a bolt gun is if your neck/throat is already tight and the additional carbon fouling makes it even tighter. Extremely rare.

^^^ This guy probably knows what he's talking about

I do recall Frank discussing on his podcast that he was shooting his 300NM and used somebody's load that had a super slow powder and detonated gases in the can??? I'm sure that's an extreme example of what could happen... Can that happen or am I misunderstanding the circumstances?

 

[Rutter]

Well I made it out to the range, I was super impressed with how well it functioned. Not only was it very quiet but you guys were right about it speeding things up a bit. My zero was only off by 1/2 a moa. Completely reworked the dope just to make sure it’s running on all cylinders. The speed gained was right at 25 fps. I got a bit excited about it so I took it to the .22lr as well. Wow. I can say that those crap ass cats around the house better start looking around before they come around. I’ll be sending in for my second ASAP. Thanks everyone for the info.

 

[trob_205]

^^^ This guy probably knows what he's talking about

I do recall Frank discussing on his podcast that he was shooting his 300NM and used somebody's load that had a super slow powder and detonated gases in the can??? I'm sure that's an extreme example of what could happen... Can that happen or am I misunderstanding the circumstances?

I’m not sure it was a detonation but there was something funky going on that made him stop using it. One load was built up with a slow powder out of a long barrel and franks was short with a can if I recall that correctly. @lowlight

 

[Zak Smith]

If there is unburned powder, it may eventually ignite inside the can. This same effect is noticeable on full auto when you see a larger flame every 3-6 rounds (sometimes). Not really a big deal. I don't know what happened with Frank's situation, or if it's the same deal, or what; haven't seen the video

 

[Anthonyc]

I’ve never heard of the need to back off a load when using a can...