Hello, im looking to get things moving in my first custom. For those who dont know i will quickly fill in. This rifles main purpose is moose, but will also be taken very often on Elk, Caribou, Black bear, Whitetail and antelope. Shots will be 800 yards and less! some shots will be 40 yards and less (moose hunting can be close). I have a very accurate 7mm mag remington 700 BDL that will be my base to work with. I am 99% sure i will be going with kevin at MCR rifles due to the fact he is close by and does amazing work as well as helped my through a lot with decisions and information for this build. I would like to keep powder burning to a minimum due to cost wise and thats why my original posts were only between the 7mm mag and the 300. mag. Recently i had someone tell me to take a real hard thought into the 300 RUM and that is the purpose of this thread. I know the 7mm mag and 300 mag are more then capable and speeds reaching 2900-3000 fps aren't unrealistic from the 7mm mag with 180 grain bergers and 2850-2950 from the win mag with 210 bergers. I have heard of a few people only getting 3000 fps from the 300 RUM which is burinng more powder without the upsize in ballistics. What is your opinion in caliber?