Accuracy decrease with supressor on

[Sykes]

This is the first time I have had a rifle that shot worse with my suppressor on. Has happened with 2 differnt loads, 88 gr hammers and 108 eldm. Both loads shoot a little under 1/2 MOA at 100 yards with no suppressor. Any explanation?

6mm Creedmoor, Bartlien #4 Carbon Fiber, 24" on a Tikka bedded in a Manners stock. BA was built by Deep South Tactical. Gemtech Tracker suppressor

1" groups at 200 yards today with the 108 eldm no suppressor.

Suppressor on the group went to 3.7"

First time with the hammers I thought it was because I was in a hurry trying to get ready for hunt. Today confirmed this set up doesn't like a suppressor. Just curious why maybe that is

 

[Plinker147]

Suppressors can Change barrel harmonics. Seen in thinner barrels when adding a suppressor. Might have to re-due load development. Suppressors can add 30 ish fps

 

[QuietTexan]

Dang, that's a lot. My first thought is drop the charge back down to 93% of your max, run one ladder up with the can on, and see if you hit a node where it calms back down, but that horizontal spread means you might be completely blown and need to change seating depth or powder, basically clean sheet the loads again.

I've had things group that badly when the velocity node is really off for the barrel, but I've never had more weight of a suppressor be what pushes the group out like that.

I have one of these to try but haven't had to yet, can be run behind the suppressor. Could trying tuning to see if that swings the group tighter:

Adaptive Tuning System - ATS - Short Action Precision

Adaptive Tuning System (ATS) New Tapered Version! This version accommodates larger barrel contours while maintaining a closer fit to the barrel to avoid catching it on barricades or external objects. Supports barrels up to 1.08" diameter approximately 2 inches behind the muzzle. Developed by...

www.shortactionprecision.com

 

[Zen Archery]

I've experienced a spike in pressure/velocity when running a can. It also shot horribly like yours. I had to tune down my load.

 

[Sykes]

Thanks guys. I'll re do the load and see what happens

 

[lancetkenyon]

I agree with the others. You are changing barrel harmonics, since you are now hanging a weight on the end of your barrel.

You should just need to tweak your load a bit.

 

[waspocrew]

^^^ Agree with everyone above. Tweak your load and you'll likely get it stacking shots again.

 

[Sykes]

This is the first rifle in 10 or 12 I've ever had this happen. The rest shoot the same if not a little better. Poi has always shifted but was predictable amd consistent

 

[Veteran]

I agree its all barrel harmonics. The weight and pressure issues your can has on the barrel timing for that load and bullet dont match up

Other than tuning the ammo, the other thing you can try is installing an ATS type barrel tuner in front of your can. Then you can tune the barrel instead if the ammo.

Bring the barrel back into tune even with the can. I run a tuner on my .338 LM in front of a super beast 5 port brake

 

[ajkellerusmc]

I have one rifle that does not like a certain suppressor. Fired with the shorter version of the same suppressor and it does fine and holds MOA. The longer model just throws shots at 8 MOA at 100 yds.

 

[skipglo]

I agree with the others. You are changing barrel harmonics, since you are now hanging a weight on the end of your barrel.

You should just need to tweak your load a bit.

Or alot!

 

[lancetkenyon]

I have one rifle that does not like a certain suppressor. Fired with the shorter version of the same suppressor and it does fine and holds MOA. The longer model just throws shots at 8 MOA at 100 yds.

Are you getting bullet strike? 8MOA is absolutely ridiculous.

 

[Sykes]

Hodgdon online max load is 41.6 of H4350 for 3006 fps with the 108 eldm. My load on target is 40 grs for 2970 fps. Bartlien recommends a minimum contour for suppressor use, can't remember what it is, but the #4 in there eyes is too light for a suppressor. Maybe there is the issue. But I run the same can on my Cooper Timberline 280AI with no issues. I'll try this weekend to rework the load with the can on and see what happens.

 

[lancetkenyon]

I thought the same but no all is good there. Hodgdon online max load is 41.6 of H4350 for 3006 fps with the 108 eldm. My load on target is 40 grs for 2970 fps. Bartlien recommends a minimum contour for suppressor use, can't remember what it is, but the #4 in there eyes is too light for a suppressor. Maybe there is the issue. But I run the same can on my Cooper Timberline 280AI with no issues. I'll try this weekend to rework the load with the can on and see what happens.

6 Creed?