They work very well - if you get the right one.
The sonic boom is nothing by comparison with the noise produced by the powder igniting.
I've just purchase two - on for my tikka 223 and one for my 243.
They also reduce recoil - and increase muzzle velocity.
As a comparison, I can now (although I dont) easily fire both rifles without hearing protection. If I did that without suppression, my ears would be ringing.
I was originally going to get full overbarrels, but after talking to Greystone Guns I decided a half length overbarrel silencer instead. I had to have the barrel shortened , but ended up with a very nicely (better) balanced rifle.
Others may have different experiences, but mine have been nothing but good.
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