Looking to start my first build ever shortly an im torn between 2 calibers with one being the 300. win mag. The slightly smaller 7mm rem mag is option number 2. I am an avoid moose hunter and is the reason for this build. I missed 2 opportunities at the largest bull i have ever seen last year cause of my rifle. I practice out too 500-600 yards with my factory rifles and have shot up too 800 on occasion on targets but i dont get the accuracy i would hope for that i can confidently take game at those ranges. 800 yards is my Max range and that is why i haven't stepped up in calibers. I am only interested in the these two. If you hunt with a 300. win mag what kind of build do you have? what is your load? what do you hunt? longest kill? pictures of rifle or game?