Pressure signs from suppressor?

[wind gypsy]

Moisture around the chamber/case instantly turning to steam seems like it'd definitely add pressure...

Maybe? I've not seen notable velocity indications of pressure, just bolt thrust.

 

[mudslinger021485]

I just got my first suppressor (Unknown Reaper) and went out to rezero with my same hand loads I’ve been using the past 900 or so rounds on my gun, felt a slightly sticky bolt towards the end of the 10 round zero. After this I waited a couple min and went into a shooting drill and after a couple shots I started getting sticky bolt that progressed to heavy bolt lift and I stopped, ejector swipe on my brass.

Next day I went out to see if removing the can when I started to get sticky bolt lift would remedy this. I shot a 10 round string, waited approx 2 min then started another string. After 3 shots on the second string I had a slightly sticky bolt, next shot was very sticky. Removed the can instantly and quickly fired 2 shots, no hard bolt lift no ejector swipes on those 2 rounds

I’m not shooting a particularly hot load in my opinion. 6.5cm 140gr eldm 41.5gr h4350 Peterson brass. I’ve never noticed ejector swipe and have never had an even slightly sticky bolt.

Is this common? Is there a reason why the design of the reaper would have this happen over a different kind of can? Again this is my first one so I have nothing to compare it to and I’m fine putting this on a hunting rifle that won’t go through long strings but I will be using this particular gun for NRL and prs this summer. I would lighten the load but I’m just at power factor minimum for nrl so I’ll just put a brake back on if I have to.

My 375 Sherman Yukon does the same thing. With just the brake its all good, I know it's near max already. But I put the TBAC Magnus 375 on and the bolt lift is sticky and i get a slight case swipe.

 

[CCCasey]

I must have got a hot batch of 7prc ammo from hornady. With my reaper on it is having hard bolt lift now. It has never shown signs of over pressure before with over 200 rounds threw it with a different suppressor.

 

[IDElkmagnet]

I must have got a hot batch of 7prc ammo from hornady. With my reaper on it is having hard bolt lift now. It has never shown signs of over pressure before with over 200 rounds threw it with a different suppressor.

Clean the gun and look for a carbon ring. My 7prc had one after a few hundred rounds.
If that doesn't work and you have the ability to switch the suppressor back to the old one an see if it goes away. Ill bet its the combo of gun and suppressor creating a pressure issue.

 

[WoolyBugger]

I must have got a hot batch of 7prc ammo from hornady. With my reaper on it is having hard bolt lift now. It has never shown signs of over pressure before with over 200 rounds threw it with a different suppressor.

Just seen a box of hornady match 6.5prc be 130 fps faster than another box. It’s possible

 

[CCCasey]

Just seen a box of hornady match 6.5prc be 130 fps faster than another box. It’s possible

Same lot# of ammo. But that is interesting that they are changing the velocity on the boxes.

 

[CCCasey]

Clean the gun and look for a carbon ring. My 7prc had one after a few hundred rounds.
If that doesn't work and you have the ability to switch the suppressor back to the old one an see if it goes away. Ill bet its the combo of gun and suppressor creating a pressure issue.

Thank you. I will do that. Hopefully that results in a fix.

 

[WoolyBugger]

Same lot# of ammo. But that is interesting that they are changing the velocity on the boxes.

the instance I saw was different lot #. You have chrono data from shooting with the reaper vs your old can?

 

[CCCasey]

the instance I saw was different lot #. You have chrono data from shooting with the reaper vs your old can?

Yes. That is also a weird part. The reaper is 10-15 slower