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Tightbores will increase FPS a bit. Barrel length also affects it, depending on your setup. I had a nice setup where I'd use a M4 length barrel to get 385fps and if I swapped to a CQB barrel it'd be 345fps (outdoor and indoor limits here are 400 and 350 respectively).
This may open up a big can of worms...but a hit at any given range with a heavier BB is "felt" more than with a lighter BB. The muzzle energy is the same...but the retained energy is more greater with heavier BBs.
Chrony your rifle to be sure. Chrony with the standard weight of BBs (0.20? for you?). Be prepared to chrony on demand. One night we were getting hammered by one dude. His shots seemed to really, really hurt. Someone asked him to chrony and he shot right up there, but below maximum. The difference between a 300fps hit with a 0.20 and a 349fps hit with a 0.20 is definitely noticeable. If you're playing with guys that are honest, level headed and respectful...a night of shooting with 300fps is a lot of fun.
In CQB (5-40ft)...there's no practical effective range difference between light and heavier bbs. There may be some accuracy difference, but at those ranges it's not very consequential for hitting a guy. There's hardly any "shot time to target" difference (the time it takes the bb to get from your rifle to the target).
At longer ranges...sure, heavier BBs are definitely advantageous over lighter BBs.
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