Looking around Halopedia and Bungie.net, the Brute Plasma Rifle’s stats state that it’s able to fire 540 bolts per minute (at automatic), it’s velocity is 126 m/s and has a power output of 100-150 KV @ 2~3 dA. One problem with this however is that this is the exact same stats for the standard issue Plasma Rifle, despite the fact that the Brute Plasma Rifle does more damage and has a higher rate of fire. This is clearly an error (on Bungie’s part), considering the modifications on the Brute Plasma Rifle and you’d expect that the stats of the Brute Plasma Rifle should reflect upon the weapon’s actual performance instead of referring to the weapon’s predecessor.
343i really needs to retcon the old stats into oblivion because good grief they’re horrific when you actually look at them.