Looking to build a long range rifle 0-1000+ Yrds will be the distance. Used for deer/bear. Wanting to build it off a Remy 700 action. Not sure what barrel brand to go with yet as I am still deciding on the caliber Possible calibers: 7mmRUM 7mmwsm 7mmSAUM 300Win 300RUM Which would you use and why? Please mention other calibers if you have other opinions/experiences.