I'm about to work up an elk hunting round for my 300 H&H and this will be my first time reloading rifle rounds. I put "important" in quotes because it is such a subjective thing. By important, i mean, how much effect do certain details have on accuracy? While I want to improve in the long run, my current goal is to be able to hit the vitals on an elk from 400 yards. That means that for me, something that may give me a .1 MOA improvement may not be that important right now (although it will be in the future). For bullets I have chosen 180gr Nosler partitions. I have always in the past bought factory ammo with that bullet for both my 300 and 30-06 and have been happy with the results so being new to this, I went with what I was familiar with. For powder I chose IMR-4831and for primers I chose WLR's based on the Lyman Reloading Handbook, which used the same rifle I have for their testing. My focus and my questions right now mainly concern the brass. Remember, this is in the context of my current goals. Just to quantify it, lets say that 1.25 MOA is acceptable for the time being. I know there are a lot of variables and that no one here can give exact numbers but I'm hoping for some ballpark figures or a little guidance as to what to focus on to start with. Case length: The length of my brass varies from about 2.825 to 2.850. How much should I separate it, variations of .005? .010? .015? Weight: I haven't weighed the brass yet so I don't know how much it varies, but at this level, how much variation in weight is acceptable? Primer pocket: Do I need to get a primer pocket uniformer or will just cleaning them get me to my goal? Flash hole: Should I bother de-burring the inside of the flash hole? Jump to lands: For testing purposes I want to make up 3 or 4 different OAL's but where should I start and what intervals should I do? .010, .020, .030 off? .015, .030, .045 off? .020, .040, .060 off? Powder charge: My thoughts are to start with 65gr until I work out the jump to lands and then work up from there. Any input in this area would be greatly appreciated.