Suppressors This 1's 4 the suppressor experts....

[Nostradumbass]

I've been pulling my hair out on this....I'm running a tigershark 30 cal can on a 6.5X47 lapua. The gun is a 1/4 min shooter, then I put the can on and it opens up the groups to about 1 moa. That's at all ranges.
The threads were cut off the centerline of the bore....the muzzle to shoulder length was .600", then I had the barrel threads cut to .750" because I was told this is ideal.

But still it shoots in the same manner. I am getting a 25 fps increase in MV with the can too FWIW. Now I'm wondering if the loss of accuracy is due to the ID of the suppressor baffles....or maybe I need to continue load development.
I'm shooting 123gn scenars right now.
Thanks!
Phillip

 

[Outsydlooknin75]

Re: This 1's 4 the suppressor experts....

How long of a barrel? You hang a weight off the end of it like a can and the harmonics are going to change, is the barrel hitting the stock now during whip?

 

[Nostradumbass]

Re: This 1's 4 the suppressor experts....

The barrel is 22.". I verified the barrel channel, and it's adequate....around .075" between the stock and barrel.

 

[lazy21]

Re: This 1's 4 the suppressor experts....

phill, so when are we going to get those little piggys

 

[BOLTRIPPER]

Re: This 1's 4 the suppressor experts....

i just had my older jaws rebuilt and it never shot so well.....i'll be taking it to Oregon this week for a match....i expect good things this time around....

my thoughts are a change in harmonics with your particular LASH-UP

maybe there is a somewhat poor shoulder somewhere in this equation that allow for a slight off-plumb hot gas let-off inside the can......just a thought but maybe a gun plumber could jock up the whole action with barrel attached , and the suppressor and check the run out at the exit hole

 

[Nostradumbass]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lazy21</div><div class="ubbcode-body">phill, so when are we going to get those little piggys</div></div>

Hey dude! As hot and dry as it is here we can shoot them right out of the ponds!

 

[blksno]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Nostradumbass</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lazy21</div><div class="ubbcode-body">phill, so when are we going to get those little piggys</div></div>

Hey dude! As hot and dry as it is here we can shoot them right out of the ponds!

</div></div>

ain't that the truth, I was down between Woodville and Livingston for a month and that's the most dry I've ever seen it.
3" one night was gone by mid afternoon.

 

[KYS]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Outsy</div><div class="ubbcode-body">How long of a barrel? You hang a weight off the end of it like a can and the harmonics are going to change, is the barrel hitting the stock now during whip? </div></div>

Hanging weight on a barrel would really have nothing to do with his groups opening up. He would see horizontal stringing if he was getting barrel to stock contact.

So I doubt what your saying is having a real affect.

I say continue load development. Have you tried shooting the 139's?

 

[Nostradumbass]

Re: This 1's 4 the suppressor experts....

KYS338, I ordered some 139gn scenars and 142gn Sierra projo's to try in the very near future....

 

[Shooter21]

Re: This 1's 4 the suppressor experts....

sounds like a baffle alignment problem to me, whereas if you were shooting a 308, you would be getting baffle strikes, but I know nothing. I just stayed in a holiday inn express...

 

[KYS]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Nostradumbass</div><div class="ubbcode-body">KYS338, I ordered some 139gn scenars and 142gn Sierra projo's to try in the very near future.... </div></div>

With you current load.... I would back it off a touch and see what happens.
Or call David at Shark and ask him to look at it.

 

[3DHUSKER]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: drunkhumpinmonkey</div><div class="ubbcode-body">sounds like a baffle alignment problem to me, whereas if you were shooting a 308, you would be getting baffle strikes, but I know nothing. I just stayed in a holiday inn express... </div></div>

LOL

 

[Nostradumbass]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: KYS338</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Nostradumbass</div><div class="ubbcode-body">KYS338, I ordered some 139gn scenars and 142gn Sierra projo's to try in the very near future.... </div></div>

With you current load.... I would back it off a touch and see what happens.
Or call David at Shark and ask him to look at it. </div></div>

10-4

 

[3DHUSKER]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lazy21</div><div class="ubbcode-body">phill, so when are we going to get those little piggys </div></div>

Lazy21, what is your rifle and caliber? It looks nice.

 

[lazy21]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: 3DHUSKER</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Lazy21</div><div class="ubbcode-body">phill, so when are we going to get those little piggys </div></div>

Lazy21, what is your rifle and caliber? It looks nice.</div></div>

it's an ar I built. pof lower, vltor mur, match 10.5 bbl(5.56), magpul m93 stock, and larue 9"rail

 

[lvmike]

Re: This 1's 4 the suppressor experts....

What about extra weight stressing the bed job on the action more/differently?

 

[rpk762]

Re: This 1's 4 the suppressor experts....

I do not know if this is the case or not but I have a 223 that shoots best with a middle of the road load. When doing load development the groups where big then got smaller as powder went up. Then as I was about 2gr from max the groups started getting bigger. This could be the same thing in your rifle. Since I only shoot this rifle at PD I ended up loading it up with a load that was a little slower than the best group so when it gets hot it will shoot better.

Hope that helps.

 

[Nostradumbass]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: rpk762</div><div class="ubbcode-body">I do not know if this is the case or not but I have a 223 that shoots best with a middle of the road load. When doing load development the groups where big then got smaller as powder went up. Then as I was about 2gr from max the groups started getting bigger. This could be the same thing in your rifle. Since I only shoot this rifle at PD I ended up loading it up with a load that was a little slower than the best group so when it gets hot it will shoot better.

Hope that helps.
</div></div>
Thanks, I'm working on the powder charge this weekend.....I will post if I find some positive results.
Phillip

 

[KYS]

Re: This 1's 4 the suppressor experts....

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: LVMIKE</div><div class="ubbcode-body">What about extra weight stressing the bed job on the action more/differently? </div></div>

Dont see how its going to affect this situation. any stress would be towards the recoil lug anyways.

 

[HPLLC]

Re: This 1's 4 the suppressor experts....

Not to insult any particular shop, but I would have the threads checked. Not too many people are capable of doing suppressor threads correctly.

When you unload the rifle and remove the bolt, mount the can and look down the bore, does it appear to be dead center of the barrel bore?

Also what is your impact shift? If it is more than 1.25 MOA, it may indicate eccentricity.

If you are within driving distance of the manufacturer, it may be worth setting an appointment and having him take a look at it.

The 25FPS free-bore boost is a pretty good velocity increase.. that of course indicates that gas pressure in the suppressor is fairly high behind the bullet. It may just be the effects of turbulence on a relatively light/long bullet. Many suppressors cause less than half that velocity increase. It's not a huge issue, but then not many end users have 1/4MOA guns.

 

[Geronimo]

Re: This 1's 4 the suppressor experts....

My tigershark did that on my trg 22 when I demo'ed it. It slowly tightened to a 1 moa group with a poi 2" low, hope it tightens back to a 1/2 moa or less when I take it home, also will adjust my load to see if that helps.