I doubt anybody here has that answer. That type of specific knowledge would only be know to people who do research. Even trained people do not know. The suppressor will slow down the velocity of a bullet but unless you are talking about specific numbers you don't know the answer. Plus every suppressor maker has different models of suppressor that acts differently with each weapon and caliber. You need the exact velocity of the bullet then make experiments using those suppressors. Plus is the weapon itself gas operated, blowback or bolt action. Again as far as noise goes you would need to set up microphones and test equipment. So unless a specific test has been done nobody knows those answers. They can guess but only if they are highly experienced with many different types of weapons and suppressors. There are very few people in the world that are that experienced. Very few people use suppressors to that extent other than some military and hunters in states that allow them. For the military it's about snipers and SOF, for hunters it's expensive to have the licenses and they usually only own one or two that can be used on different weapons.

The suppressor affects everything. It changes your "feeling" for the rifle. If you get used to it without silencer, after placing one you have another rifle. It's the same as playing Gibson Les Paul and after 2 years buy a Jackson King-V.

The sound of the rifle is reduced but not eliminated, as stated, without setting up microphones it would be almost impossible to tell how far it could be heard. The bullet however is supersonic and will create a shockwave or crack as it travels. This cannot be suppressed unless subsonic ammunition is used. Of course, using subsonic ammunition will greatly affect range. In that case, a very heavy projectile is used to help keep the velocity down and energy up. See tests done with the 300 Whisper or similar cartridges.