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.
My father purchased a Browning X-bolt in 325 WSM and it shoots the 200 gr Accubonds scary good. I did the break in for him (he is getting a little...old :p) and the load development. It shot really well with H4350.
if LR moose and elk are on the table I would rule out the 7mm. not that I think it cant kill well at those ranges I would just opt for a little more "umph". I am one to lean more towards overkill than not but for me I think I would go for a 300 win. I feel that the 300 ultra is too much extra cost for the performance, especially if your going to shoot it alot. dont get me wrong, i really like the 300 Ultra but for a one gun guy... which it sound like you are, I would opt for efficiency.
I am also a 7mm guy and from what I am gathering from your post that the moose will more often than not be your closest kill and the deer and elk are more apt to be the longer range kills. With that being said my vote is with a 7mm rem, 7mm-300 win mag, or 7mm stw. If it were me going with the 7mm rem or 7mm-300 I would chamber it a 28 inch barrel and for the stw I would go with 29-30 inches. The reason for the long barrel length is to milk the most efficient powder burn out of each caliber. I currently have a 7mm rem mag chambered in a 28 inch barrel and running the matrix 168gr bullet with a bc of just over .700 scooting out at 3080 fps. With such a high bc bullet at that speed it is still packing a 1260 ft-lb punch at 1000 yrds. So if you are concerned with the amount of powder burned in relation to efficiency I would strongly look at the 7mms with high bc bullets and run the numbers and make an educated decision. But remember no matter which one you go with you will still have fun im sure.