When I purchased my .338LM, I bought several boxes of S&B to sight in the scope and get used to shooting the rifle at several distances once sighted.
The best avenue to take when shooting the likes of .338LM, is to get into reloading. Good/Match factory ammo is just a bit too costly to really reach out for long range shooting. Reloading will provide excellent accuracy and will cost substantially less per round.
As mentioned above, I also read that Lapua brass is the best to use when reloading a .338LM. As I was shooting the rifle with S&B, I began to search for once fired .338LM Lapua brass. Over time I managed to get my hands on 160 once fired on the EE. 100 for $1.25 and 60 for $1.50, which is a very good deal if you check what a box of unfired .338LM Lapua brass sells for!
Two of my sons each bought me a box of 20 Federal Gold Match .338LM for my last birthday. I've almost finished it, so those 40 once fired will add to the brass collection.
However, I got really lucky a couple of years ago and found a guy on the EE that had 9 boxes of 10 = 90 rounds of factory .338LM Lapua match ammo! I ended up buying it from him for the same price I was paying for S&B factory!!!
I should be set up to reload for this coming summer.
I've still got the S&B brass, which is once fired and from what I understand is very good to reload. If you want what I have, you pay for shipping and they are yours.
Also, recently I noticed a member on here (DG Photography) had some excellent quality .338LM ammo for sale a while ago. You may want to send him a PM to see is he still has any left.
http://www.canadiangunnutz.com/foru...mmo-10-round-sealed-boxes-same-lot-very-cheap!!
Cheers,
blackacres