Regardless of how the weapons 'act', you cannot fix the ping of players playing over great distances.
The server also has 'bullet_sync' turned on, but again requires more bandwidth.
Regardless of what you do to the weapons, if the 'ping' is stopping you from acquiring a 'hit', it will happen regardless of range or speed of the weapon.
The weapons act the same on all people, so if you hit 'stunned' by a sniper or shotgun blast, it's also gonna happen for everyone else.
Again, there is nothing we can do about people lagging.
Play smarter, not harder.
We have two pages of this topic and the only person complaining about it is you.