There's nothing wrong, your chamber throat is longer than your magazine length allows. This is common in production rifles, it may be on the long side, but you can use hotter loads and still be safe.
IMHO, there is too much bandied about on the interweb regarding how far the bullet is from the lands and accuracy, it is a complete fallacy that a bullet has to be close to the lands for exceptional accuracy, throat design plays a bigger part in accuracy than how close or far a bullet is from the rifling.
I suggest you load your cases to just shy (-.010") of mag length and test for groups, then load some at .010" intervals*DEEPER into the case, upto about 3.290", you may go deeper, but keep an eye on how far the shank is below the neck/shoulder junction, you won't want anymore than about a third of the bullet length past it. If you don't find a good group doing this you may have to try different powders until you come up with a good one.
My favourite in the 300 is RE25 with 180gr and 200gr Accubonds, my rifle has a fair jump to the lands too, it still shoots into .5MoA consistently and the less than regular .25MoA when conditions are perfect, including me!