Re: 300 win mag or 300 rum?
Just noticed your location in Montana. There is a 1000yd BR range right there if your not aware. Myself or Darryl C. can get you in touch with some of the boys at that club. They have a 11# class that they shoot there along with the 16.5# and heavy Gun class also. It would give you some good experience and you would have a bunch of fellow shooters to ask all the questions you wanted and get to see and touch the equipment first hand.
Just a suggestion only..... Good luck with your new toy. A 300 Win Mag isn't the newest wildcat on the block, but the ol' caliber still gets the job done in the accuracy and killing departments both. Have fun.