I am looking to start building long range rifle for F-class 1000 yards. I have a 300 WSM rifle with a Montana 1999 action that I use for hunting but I spend more time punching holes in paper now. This rifle has a 24 in #2 contour sporter barrel, wood stock unbedded and it shoot under 1 MOA at 100 yards with 66 grains of reloader 17 and 155 nosler custom competition bullets. My thoughts our with a barrel and stock it might do ok??? I have been trying to research and been told that I should go with a Remington action. So the question is Remington style action or Winchester style action? Will take any advice either way and was wondering if any one has used a Montana Action? The other major question 308 or 300 WSM and I am not worried about barrel life? But I am wondering what kind of barrel life that people are getting out of the 300 WSM. Last question what is the minimum barrel contour and length of barrel for 1000 yard 20 + round strings.