Re: Goal $1000 rig
I don't know which sling Chris is recomending. I have one that's elastic to some extent. I like it in conjunction with my Extendable Harris Bipod W/Swivel. If this is to be a field gun for the ranges you mention, then add $80 for the Bipod. I saw a sling position In Varmint Hunter Mag for sitting with a Bi-Pod that I find as near a bench as anything in the field. It's a little contorted, but boy is it solid.
If you have something that you disassemble and reassemble enough times, sooner or later, you'll have two!