Suppressors Suppressor and pressures ?

[dvdt]

So I'm trying to make a decision on a suppressor. I'm a buy once, cry once kinda guy.

Here is what I *think* I know:

If you have developed a load for a rifle and if it is close to or near the razor edge of pressure, adding a can will likely push you over.

It probably makes sense to do load development with the can to account for the additional weight and to get the correct velocities for the environment.

Is there any intelligent way to determine whether a particular 30cal can would add more or less pressure than another without just simply testing them ?

I'm looking at the Shark and TBAC 30P-1. Leaning towards the TBAC can just because of cost.

The primary goals I'm looking for:
- Accuracy
- Repeatable
- Stop that damned muzzle blast (currently using a brake)
- Recoil reduction
- Sound suppression

The hosts:
6.5CM bolt gun w/ 24" Rock Barrel
(future purchase) GAP-10 22" .260 Rem

I'm concerned about pressures with these two cans. I'm not running my 6.5CM very hard. The load is 42.4gr Hodgdon H4350, cci br2 and 139gr scenar. It's ~2750 @ 80F.

The GAP-10 .260 will be a 22". It's also a DI rifle (not sure if that matters). I don't plan to run it on the razor edge but definitely will want decent velocity out of it.

I probably won't be able to hear either of these cans prior to purchasing.

I think we all know they're great quality cans. They're both accurate and repeatable.

What about pressure and recoil reduction ?
Anyone have any data they can share on a .260/6.5CM and pressures with either of these cans?

Thanks!

 

[D_TROS]

Re: Suppressor and pressures ?

While I dont have any data, it makes sense to me that a suppressor does NOT add any pressure to the ignition of the cartridge in the chamber, any more than a longer barrel would add pressure (I'm saying neither adds pressure). Pressure is the a result of the amount of powder in the casing and bullet seating depth. Once the added volume of a barrel is added behind the bullet, the pressure decreases. the 'ol P1V1=P2V2

As to doing load development with the suppressor on, that is a very good idea due to the fact that the suppressor, no matter how light, will effect the harmonics of the barrel, and almost every suppressor will have some POI shift from not having it screwed on.

Regards,
_DT

 

[BOLTRIPPER]

Re: Suppressor and pressures ?

you do know that what ever you shoot thru your new purchase......them boolits will chrono at a higher speed,,,,its called ...........BONUS!

.260 or .308,,,,same same, them projos will chrono faster....


just sayin

 

[dvdt]

Re: Suppressor and pressures ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: BOLTRIPPER</div><div class="ubbcode-body">you do know that what ever you shoot thru your new purchase......them boolits will chrono at a higher speed,,,,its called ...........BONUS!

.260 or .308,,,,same same, them projos will chrono faster....


just sayin </div></div>

Yep, thanks for pointing that out. I had a bunch of folks respond to this thread:

http://www.snipershide.com/forum/ubbthre...800#Post2675800

Looks like anywhere from 15-50 ft/sec. Thanks for the reminder. Believe me, I'm counting on it!




Can others help out with the reply by D_TROS ? Seems that sends me back to the drawing board...

 

[308sako]

Re: Suppressor and pressures ?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: dvdt</div><div class="ubbcode-body">So I'm trying to make a decision on a suppressor. I'm a buy once, cry once kinda guy.

Here is what I *think* I know:

If you have developed a load for a rifle and if it is close to or near the razor edge of pressure, adding a can will likely push you over.

<span style="color: #000099"> I have found this to be true with my Rock Creek 5R 26.5" .308 and both my 155 and 175 loads with Varget. Dwell time is the culprit, the pressures aren't higher, they just get to act longer.</span>

It probably makes sense to do load development with the can to account for the additional weight and to get the correct velocities for the environment.

<span style="color: #000099">Absolutely true and this is what I did. I lost about 70 ft/secs with the 175 grain load and have no undo pressure or brass wear now.</span>

Is there any intelligent way to determine whether a particular 30cal can would add more or less pressure than another without just simply testing them ?

<span style="color: #000099">I would only venture a guess that the better the suppression, the more the effect would show. Note: that on my fellow shooters shorter barreled rifles, the dwell issue is not as pronounced.</span>

I'm looking at the Shark and TBAC 30P-1. Leaning towards the TBAC can just because of cost.

The primary goals I'm looking for:
- Accuracy
- Repeatable
- Stop that damned muzzle blast (currently using a brake)
- Recoil reduction
- Sound suppression

The hosts:
6.5CM bolt gun w/ 24" Rock Barrel
(future purchase) GAP-10 22" .260 Rem

I'm concerned about pressures with these two cans. I'm not running my 6.5CM very hard. The load is 42.4gr Hodgdon H4350, cci br2 and 139gr scenar. It's ~2750 @ 80F.

The GAP-10 .260 will be a 22". It's also a DI rifle (not sure if that matters). I don't plan to run it on the razor edge but definitely will want decent velocity out of it.

I probably won't be able to hear either of these cans prior to purchasing.

<span style="color: #000099">You will be pleased with a quality can's sound reduction. I would also think that a 6.5 bullet transiting a .30 cal can would not have quite the issues with dwell time and pressure. I have used my AAC Cyclone on and AR in 5.56 and the suppression was excellent. Un-professional observation.</span>

I think we all know they're great quality cans. They're both accurate and repeatable.

What about pressure and recoil reduction ?
Anyone have any data they can share on a .260/6.5CM and pressures with either of these cans?

Thanks!


</div></div>

 

[squin]

Re: Suppressor and pressures ?

I have a TBAC 30P-1 waiting on the tax stamp. This will be primarily used on my 260 bolt rifle and my 264 LBC AR (Grendel). Both rifles have 24" heavy barrels and shoot in the high 3's to low 4's if I take my time. My dealer was kind enough to join me at the range the other day and let me shoot the can. Groups at 100yds on both rifles showed no real impact on group size. POI shift for the bolt rifle was nill. POI shift for the 264 LBC AR was 3" low. Moved to 575 yd with the 264 LBC and hit a 5" plate 5 out of 5 on my first attempt. The 30P-1 is an amazing can. The 264 LBC was filthy when I got done, but cleaned up easily.

 

[GreatGonzo]

Re: Suppressor and pressures ?

My Creedmoor shoots that same load to 2780 with the suppressor (30 cal RPG T1000ti) . No pressure worries at all (my normal load is 43gr). If you are not getting pressure signs now, you likely won't have any problems with the can on. I would probably run the factory load at it (42.0 gr H4350) just to make sure, then build up from there.

The 2 cans you mention are certainly good quality suppressors. I have shot the Shark, it works well, it is very similar to the RPG can that I shoot. I have shot with lots of people with the TBAC, it seems to work well. I shoot 223, 6.5 Creedmoor, 280 Ackley, and 308 through mine. The recoil reduction is huge and in my opinion, the best part about running suppressed.