I have been hunting with a second-generation Remington Sendero in 7mm RUM for the last several years. I have taken a moose, black bear, elk, whitetail, boar, and even a grouse with it. I am only at about 350 rounds down the barrel, but I recently moved to CO and now have a place to practice out to 1000 yards. My plan is to shoot the barrel out by next spring and replace it before next hunting season. My current load is 95.1gr Retumbo with a 162gr ELD-X at 3.650" OAL. This averages 3390 fps with an ES of 9fps for the 5 shots I chrono'd. I am pretty sure I would like to stick with 7mm RUM as I like the performance and availability of components. When I bought the rifle I planned on rebarreling to 300 RUM when the time came, but I don't think I want to buy new brass and dies and deal with an increase in recoil for a slight increase in killing power and barrel life. I am planning on rebarreling with a longer barrel, possibly a 29-30" light palma contour (any rifle can be a mountain rifle if you are in good enough shape.) I want to be able to pick from the longest, slipperiest bullets available (175gr and 180gr ELD and the 180gr and 195gr Bergers,) so I'll be going with a 1 in 8" twist barrel. Does anyone have a recommendation for a good gunsmith in central Colorado? Would it be best to use a standard throat length or would I have better results with a longer throat? Also, how long of a magazine will I need to put the bullets close enough to the lands for optimal accuracy? Is there a chassis stock that would allow me to use a magazine of this length? I have been thinking about going to a chassis stock; it might be practical to do so now instead of after I have had the current stock adapted for a Wyatt box and bedded.