I found a really good price on a Remington model 700LSS. The cartridge is 338 Remington Ultra Mag. I have been reading alot of posts about cartridge's, but I have not seen many posts on this cartridge. I was wanting to put together a long range elk rifle. What are the pro's and con's of this particular rig, and cartridge??? The rifle is NIB, and Left Handed. Thanks, Tom.