I agree with all of your fix issues, with the massive exception of shotgun ranges. In real world (depending on load) the effective range for most shotgun loads is 40yds. In game, it is about 25yds. Distance should be increased.
Most rifles in game fire a 7.62x54r, maximum effective range is about 800yds depending on wind velocity. In game the distance is maxed somewhere over 300yds with ridiculous arc. That needs to be fixed now!