Isn't it the purpose of the new "gunrunner" scout mastery ?
just test it. It not works with Int*2. But with shottyman works perfect. Elephant gun + Gunrunner mastery + Shottyman = fire & reload & move in 0.28 s
And because SM now works with rocket launchers too, killing bosses like Cyberdemon/Mastermind/JC with RL become fun.