I am thinking about "up grading" my RUM... in time. The furthest I would be shooting out to with 210 Gr bullets would be around 1300 Yards. What barrel weight would I need to get this done? I am thinking about a 28-30 inch length barrel. Would a Brux #6 Heavy Bull Sporter (4.5 LBS) be heavy enough or would I need something bigger? I would like to keep it as light as possible, but having the right set up is more important.