I am currently looking into either building/having built/purchasing a precision rifle platform capable of 1000+ yard engagements. I have been using a bolt Mosin-Nagant 91/30 that I have done some work to myself to improve it and it has suited me well out to around 300 yards but beyond that I find it's age and style lacking though the power is more than adequate. What I am looking for is some general opinions of different calibers and rifle manufacturers. I think .50 is a bit excessive for me, and too costly to do any kind of valid training with though .338 Lapua would be fine and nothing smaller than a 300 WSM as if memory serves me most calibers below a .308 are 800 yards maximum effective range anyway. The goal of this platform is to engage a 6 inch target at 1000 yards, current budget is 3000. Budget is flexible if the advantages of spending more are notable.