You can swap for the 338 Lapua box and have a longer COAL if you have a Mark V.
FYI, if you try a Hammer and your rifle is a Mark V, buy a sample box, load a few without powder and primer, and fill the magazine. Run them through several times. Be very sure that the tip of the bullet doesn't catch on the back of the barrel as you feed them in. I've had poor luck with the regular Hammer Hunters in Mark V rifles when it comes to feeding them. They shoot beyond belief, so it's a good thing I haven't needed to get a quick second shot.
If they ever put a plastic tip on these it would fix the problem, but I don't foresee that based on conversations with Steve.
Running 180TTSX in my 300 Wbys with 7828SSC.
His is a Vanguard. Does not come in 338 LM
I have used three powders in my MK V 300 very succesfully
IMR4350 with 180 BT
IMR7828 with 180 TSX
RL22 with 200 AB and Partition