Looking for a suppressor for my Christensen Arms MPR in 6mm Creedmoor. Thanks!
You will find it very difficult to achieve satisfactory noise reduction on a 243 caliber gun.
My best guess would be 22 long rifle to 22 Magnum unsuppressed.
Of course it is completely possible to load a very quiet 6 mm round. Even whisper quiet. The problem is it's not going to be worth much after a hundred yards or so
With that said, I shoot 300 grain 45 Colt rounds super quiet through a lever gun with a suppressor. 300 grain under a hundred yards is very powerful. But after 100 yards I am shooting rainbow arcs