The 3000 has the same diameter spool as the 2500, just deeper. It will not increase your casting distance,a larger outside diameter spool is what increases casting distance not spool capacity. The 4000 size has a larger diameter spool and weighs only 9 oz. I love my 4000 ci4+, better cranking power, better casting distance, and 9 oz balances well on most of my spinning rods.