Shroud causing inaccuracy

[josh3rd]

Yesterday I was at my permission and my Prosport was shooting erratic. I thought maybe I bumped the scope and/or scope settings and I was chasing my poi via clicking. Now my Hawke Air Max 30SF isn't the greatest clicking scope (IMO) but it usually goes where needed within a couple of shots. But not that. WTF!!! Then I noticed that the front piece of the shroud was about 1/4" out as to below flush as they normally are. I tapped it back in a viola back on point. So I assume now that a change in that are can and will cause accuracy issues

 

[addertooth]

Yes, Changes in the shroud can change point of impact (POI). Some have reported that change in tension/tightening of the shroud also affect POI.

 

[SDplinker]

Shrouds and LDCs are notorious for causing this. Just one more thing to move around and affect the barrel. However, if like you me you want to shoot it home it's the price you pay...some of these suckers are loud.

 

[Springrrrr]

The shroud in many guns has a barrel attachment of some sort at or near the muzzle end therefore any movement in the shroud moves the barrel too. It is a main source of distress in the Umarex Gauntlet that has been addressed in a number of ways by some of us on this and other forums. Now Umarex has included a band on their 25 cals.to help prevent this movement.

 

[josh3rd]

Addertooth it's insane how something so minor can cause something so major. That's why I love shooting. The discipline it takes.

 

[josh3rd]

Well springrrr mine slips over the entire barrel with baffles pushed into it. Nothing screwed. But none the less it can and will cause issues

 

[elh0102]

I'm not aware of any shroud that does not have some attachment to the barrel. Either an air stripper or some type bushing is needed to center it at the muzzle. And some have a second attachment at the breech end, usually involving another bushing of some sort. In my experience, some are much more sensitive than others in their resistance to POI changes from minor bumps or disassembly. Even though my FX Crown has the most complex barrel system of my rifles, it seems rather consistent in its ability to maintain POI. But, as a rule, if I do anything to the shroud, suppressor, or related parts, I never assume the same POI. 

 

[josh3rd]

Elh0102 true about the attachment but the prosport's shroud is "glued" to the barrel

 

[elh0102]

Elh0102 true about the attachment but the prosport's shroud is "glued" to the barrel

Sorry, I obviously wan't paying enough attention to the rifle we were discussing. I'm not familiar with it, but it sounds more like a sleeve that a shroud, but moving it around would have a similar effect. 

 

[donwalk]

sometimes a 'shroud/brake/stripper' shifts, or may not be installed correctly, causing impingement of the pellet. that will definitely cause a change in POI and usually erratic POI's.

impingement is usually quite visible inside the shroud/brake/stripper ID. usually, realigning and retightening will correct. in the case of the ProSport, pushing them back in is the only remedy beside removal.

 

[josh3rd]

Thanks Don

 

[elh0102]

sometimes a 'shroud/brake/stripper' shifts, or may not be installed correctly, causing impingement of the pellet. that will definitely cause a change in POI and usually erratic POI's.

impingement is usually quite visible inside the shroud/brake/stripper ID. usually, realigning and retightening will correct. in the case of the ProSport, pushing them back in is the only remedy beside removal.

I have had only limited experience with a pellet nicking a suppressor. That resulted in something much more significant than a slight change in POI, very wild flyers, pellets keyholing, etc., no missing it. I think the difference between a change in harmonics compared to a pellet actually striking something is relatively dramatic. 

 

[Springrrrr]

Well springrrr mine slips over the entire barrel with baffles pushed into it. Nothing screwed. But none the less it can and will cause issues

The Umarex Gauntlet barrels are also pushed into by the shroud via a spring and a so called moderator. I found by adding another spring to the factory one thus putting some serious pressure on the barrel, it helped prevent POI shifting.