I have access to a 23" Hart 6mm barrel that is currently not doing anything. I'd like to make something of it maybe along the lines of a walking varminter but don't know what caliber I want to do it in. It's a 1 in 14 twist so they'll be light (58gr Horn Vmax?) bullets and I'd like to scream them out of there but not so much so that my throat looks like railroad tracks inside of 1000 rounds. My first thouhts were 6x284, 243 wssm, or 243AI and my huntin buddy suggested 240 Weatherby but my concern with all of the above is that I won't have enough barrel length to make any use of their case capacity. Should I just stick with the plain ol 243? Good caliber, surely would get the job done but it doesn't really "blow my skirt up" so to speak. Any ideas? I'll be screwing it on a Savage action, and have a short and long available so either length is fine with me.