I am inquiring about the report heard at the target, not the shooter.
Same answer. If you start with a louder sound it will stay louder but if you can't really tell the difference at 1 meter you won't really be able to tell the difference at 100 or 1000 meters.
The intensity of the report will decrease over distance.
Go to this link.http://www.sengpielaudio.com/calculator-distance.htm
Scroll down and enter the data then press calculate.
Let's say there is a 3dB difference between the rifle and the pistol, here is an example of the change between two different blast intensities at 100 meters vs 1 meter.