POI change with Thunderbeast 30p1

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11-11-2012, 20:20
TriggerHappy

POI change with Thunderbeast 30p1

4 1/4 moa elevation difference at 100yards, with a can and without. Doesn't seem right. Anyone else have this much difference?
11-11-2012, 21:44
ColoWyo

I don't have my log with me, but I bet my Cyclone shifts close to that.
11-11-2012, 21:50
Great-Kazoo

All my suppressprs have some POI variance.
11-11-2012, 22:23
asmo

Quote:

Originally Posted by TriggerHappy

4 1/4 moa elevation difference at 100yards, with a can and without. Doesn't seem right. Anyone else have this much difference?

Don't have my log book handy but that's close to what mine is as well (30 BA).

EDIT: Ignore this post. I was thinking about a different suppressor of mine. See below for actual results.
11-11-2012, 22:24
DeusExMachina

My AAC Mini gets at least that. I thought the TBACs were supposed to be better though...
11-11-2012, 22:43
ColoWyo

What rifle do you have it on?

As long as its repeatable, no biggie.
11-11-2012, 23:13
TriggerHappy

FN PBR XP
Yeah, its repeatable, just a much larger difference than what I expected. My SF mini was hardly noticeable.

Thanks guys!
11-11-2012, 23:14
TriggerHappy

Quote:

Originally Posted by DeusExMachina

I thought the TBACs were supposed to be better though...

Kinda what I was thinking.
11-13-2012, 13:19
CO303

I'm getting 2.5 inches on my AR with the can.
11-17-2012, 09:16
RANGERRON72

Right answers, wrong question. Needless to say, if you affect the end of the barrel (i.e. adding a can), you will affect the POI.

The question is, with the can on (assume direct threading), how consistant is the POI? Thunderbeast are great. And any quality can, should have consistant POI.

Key for shooting is your data book (one benefit of being a competiitve military shooter) and being able to screw on the can, crank in the adjustment, and be 1/2" MOA on the first shot.

FWIW
11-17-2012, 09:44
TriggerHappy

Thanks guys for all the responses.

I totally understand POI and that there will be some when adding a can. I guess I was just spoiled with my first purchase by buying a Surefire. I guess that means more dope for me.....oh wait that sounds bad. Thanks!
11-17-2012, 15:50
ColoWyo

As long as you re-zero your scope, your dope will be the same.

Now get back to telling pilots what to do.
11-17-2012, 16:20
TriggerHappy

I didn't think of it like that.

Wilco. Lufty is Rollin.
11-17-2012, 16:44
islandermyk

Quote:

Originally Posted by TriggerHappy

I didn't think of it like that.

Wilco. Lufty is Rollin.

There's good beer on that one! [Coffee]
11-17-2012, 16:59
ColoWyo

Quote:

Originally Posted by TriggerHappy

I didn't think of it like that.

Wilco. Lufty is Rollin.

I chuckle every time I think about that story.
11-17-2012, 18:10
TriggerHappy

Quote:

Originally Posted by ColoWyo

I chuckle every time I think about that story.

That one was for you.
11-27-2012, 10:53
Zak Smith

Hi,

The cast majority our customers have less than 3 clicks of adjustments (ie, less than about 0.75 to 1 moa) going from unsuppressed to suppressed. In most cases, the poi change is due to deflection of the barrel: a stiffer barrel will have less change. However, in the remaining minority of cases, we've noticed that the rifles have a larger shift. This is usually due to one or more of the following: thin barrel, weird harmonics, additional forces on barrel that affect dynamics (e.g. gas guns), or some other rifle "build" issue. A shoulder that is not cut exactly square or threads that are not concentric to the bore could also cause it.

In the end, if you look through the breech and the suppressor looks centered and you're not getting baffle strikes, and it's repeatable and accurate, I would recommend to just shoot it.

hope this helps
Zak
12-01-2012, 12:06
asmo

Here is a picture of my shot placement difference between suppressed and unsuppressed using a TBAC 30BA. My point of aim (and impact when unsuppressed) is the bottom left tip of the triangle.

This is a 5 shot group at 100m, removing the suppressor and putting it back on - twice. In other words - very repeatable.

http://caliban.dreamscope.com/chance/picts/IMG_7386.jpg http://caliban.dreamscope.com/chance...386_detail.jpg
12-20-2012, 04:53
TriggerHappy

Ok. Maybe my question was confusing. Where is your un-suppressed group and your suppressed group? Shoot holding center, then can it, shoot holding center. How much MOA difference?

Quote:

Originally Posted by asmotao

Here is a picture of my shot placement difference between suppressed and unsuppressed using a TBAC 30BA. My point of aim (and impact when unsuppressed) is the bottom left tip of the triangle.

This is a 5 shot group at 100m, removing the suppressor and putting it back on - twice. In other words - very repeatable. http://caliban.dreamscope.com/chance...386_detail.jpg
12-31-2012, 00:39
coyote3

With the can on it shoots 1/2 moa high at 100yds from the no can zero. Seems to do it every time.
12-31-2012, 09:34
asmo

Quote:

Originally Posted by TriggerHappy

Ok. Maybe my question was confusing. Where is your un-suppressed group and your suppressed group? Shoot holding center, then can it, shoot holding center. How much MOA difference?

No your question wasn't confusing - I was just a dumb ass and didn't take a picture of the target I was shooting at un-suppressed. We were taking the suppressor on and off looking for repeatability so I was shooting at one target with the suppressor on and another target with the suppressor off.

The unsupressed target was identical (on the same board right next to the one I took pictures of) but I was aiming at the corner of the triangle on it. The group was similar (one flyer about an inch high and 1/4 left). Next time I go out (and remember) I will take pictures of both targets (or just use the same target now that I know that they aren't wildly off).

Sorry for the delay in the response - I forgot about the thread.
12-31-2012, 10:04
TriggerHappy

Thanks. Makes sense.