Point of impact changes with various suppressors (shooting .22LR)

[Odd Job]

The second suppressor I tested was another ASE Utra Dual Rimfire, this time designated number 1. I have 3 of these cans and this was the first one I purchased, a few years ago. I tried to position the baffles for a 9 o' clock orientation but I think it is somewhere between 8 and 9 o' clock:



Here's the TDS target:



I took the baffles out and cleaned them as before, and the inner tube and replaced the baffles. I was aiming for 3 o' clock but they ended up more like 2 o' clock:



Here's the TDS group:



Then, just for giggles, I put a special adapter on the rifle, which is a UNEF to UNEF adapter (same to same). It is a handy thing to have, for a test like this. I did not rezero the rifle, I got a group with no suppressor, just the adapter was attached. Here is the original control group on the left, and the group with the adapter installed, on the right:



So, the group moves right without even attaching a suppressor. The mere presence of an adapter put quite a change of POI on the rifle.

Then, also for giggles, I attached the same suppressor (ASE Utra Dual Rimfire number 1) to the gun. Here's the adapter and suppressor:



The baffles sat at 6 o'clock, whereas they had sat at 2 o' clock without the adapter (because I didn't take them out this time).



Here's the TDS group:

 

[MachIVshooter]

Those cans seem to have a lot of influence on trajectory. Not surprising with slant baffles, though.

 

[Odd Job]

Those cans seem to have a lot of influence on trajectory. Not surprising with slant baffles, though

I would like to know what the mechanism is. Whatever is going on, it influences the trajectory of the bullet coming out of the can with a flat end cap and hole. I wish I had high speed video of the gases coming out of the end hole.

 

[Odd Job]

On another note, do you get trajectory changes if you rotate your clipped baffles in the tube? It seems to me that you should experience it also, similar to what happens with the A-TEC CMM suppressors which essentially have asymmetrical clipped baffles.

 

[Odd Job]

Here's another interesting test, this time I got another shooter to help. First is a control group, no suppressor, using the same batch of RWS Target Rifle I have been using in this thread:



Second group was with a Wildcat Predator 12, with long reflex tube:



Third was with a prototype, where the rear components of the Predator were mated with an ASE Utra Dual Rimfire (number 1 of 3). The baffle orientation was almost 12 o' clock:



The last group was done with the ASE Utra Dual Rimfire attached directly to the gun. The baffles orientation was almost 3 o' clock. This was the group:

 

[Odd Job]

Here are the groups of six different shooters, firing the same rifle with the following configuration:

1) R55 Benchmark rifle as seen in post 1, front bipod, rear bags
2) Distance was 25 yards, ammunition was SK magazine, in the bulk tin
3) On the gun was a prototype device I made, to catch suppressor residues. Attached to that "spider" was an ASE Utra Dual Rimfire suppressor. I have three of these and this was number 1

Here are the groups...

Shooter 1 (me):



Shooter 2:



Shooter 3:



Shooter 4:



Shooter 5:



Shooter 6:



This was all done with the scope unchanged.

Earlier in the day I shot this group (before adjusting the scope):



Next test will be with an A-TEC suppressor with RWS Target Rifle. I am expecting the groups to be very good.
I need to clean the rifle first though, and inspect the action because I am hoping less crud has accumulated in the rifle.