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Suppressors How do suppressor affect accuracy?

Im running an ultra 7 30 cal. Ive only
Really used it on my gas guns. Built a 22 creedmoor for coyotes and running a can. It was built by a very good gunsmith. Well for 170 rounds I chased load development with 80.5 bergers and 75 elds. Best I could get was .5-.6” at 100. I had 4 rounds left and light bulb finally went off and I took the suppressor off. Shot 0.26” four shot group.

So I load 5 more. Shot another .2-.3 five shot group. Not sure what the issue is but a very significant improvement in accuracy. Could the .30 cal bore cause too much turbulence or something. Or do you think its a harmonics issue?
For a hunting gun .5-.6 ain't bad with the noise suppresson a plus.
 
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