A few years ago I worked with the USDA on a managed deer hunt and they were using a .243 with a noise suppressor. The shot hand-loaded, fMJ rounds. It was a treat to watch some of these guys shoot. and you did not even have to wear ear plugs!
So, you could always try contacting the USDA about managed deer hunts and take it from there, getting the right guys on the phone and then asking them where their noise suppressors come from.
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