Borderlands – What Overcharge Capacity means in Borderlands

The main Multiplayer mode is co-op.

I would level as co-op from now on. It's very fun (up to 4 players), mobs become more difficult and loot is better.

What is nice about co-op is that each player continues to play in their own story but you all play together (for example 3 people help you on your Quest xy but they already did it).

As far as I can remember, the player's game with the least progression is always the game the other players will also play in.

Refers to how many rounds it fires, and possibly also how quickly it fires them. A quick search turned up this post: +burst fire count.

Basically, Burst fire is how many shots it fires off in the span of a normal shot. So a gun that shoots 1 round a second would be 1.0 ROF, but if it was burst +100% it would shoot 2 every second. A burst fire pistol with a +500% will shoot 6 rounds in the time it would normally shoot 1. So... 1 trigger squeeze = 6 bullets. The 10,000% on Sledge's shotgun just makes the rounds almost instintanious, since it's only a 2 round gun. Basically double barrel.