I have an older Ruger 7mm mag that I have replaced with a Remington Sendero. The Ruger was an ok shooter out to 300 yrds but couldn't find a load that would shoot to my standards beyond. I am wondering if any of you have any advice on re-chamber/barrel for this gun. I know it's not the most desired action to build a rifle on. Thinking about a 6.5? Like the stats on the 6.5mm Rem. Mag, however see that is not popular and hard to find brass. Thoughts?