COAL Info

I'm looking at buying some HSM .338 ammo for my BA110.
Looking at the COAL options listed,what should I go with?
Thanks.
Mark

HSM 250 gr. HPBT Match (Sierra Match King)
2800 fps
B.C. .587

This is available in three lengths. Please specify which length you need depending on magazine and throat.
3.600"
3.680"
3.760" for newer rifles such as the Accuracy International.

I just remembered, I had a few boxes from months back I just found.
COAL is: 3.600

Thanks anyway.