Yeah 3 more rounds is a huge help, not because of missing shots, mainly due to 2v1 and 3v1 enagements. Most good PVP teams will have at least 2 guardians sticking together for support, if not three guardians. Those extra three rounds will help along with the faster reload, couple that with faster reload speed for hand cannon gloves in a gunslingers hand and you got an extremely awesome weapon. The net effect is a lot more than what you are describing.