Do you already have a proper long-range rifle? If not, I strongly, strongly recommend getting something in a cheaper, more manageable, easier-to-learn-on caliber than .338LM (or any "magnum" caliber).
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Practical Long-Range Rifle Shooting, Part I - Rifle & Equipment
I don't know anything about your background, so don't take this the wrong way. Skill is much, much more important in making long-range hits than caliber or rifle or equipment (provided they are just merely adequate). The way to get skill and experience is through a lot of proper practice and training. Calibers such as .308, .260, 6.5x47, 6XC, etc, and much better for this than magnum calibers. They have small fractions of the recoil, are cheaper to shoot by usually a 2x+ margin, are "legal" in many more matches, etc. If you just want to hit stuff really, really far away (say 1250 plus), you can do that with 6XC, 243, 6.5-284, 7RM, 7WSM, etc.
I did a review of the TRG-42 here
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Military .338 Lapua Magnum Rifles: the Sako TRG-42 and the AI-AWSM
The .338LM is a great round (and I've shot thousands of rounds of it), but realistically, I replicate the 300gr SMK .338LM load using my 7mm RM, and if I could own only one or two proper long-range rifles, neither of them would likely be the 338LM (maybe #3
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I have no experience with the DT SRS, other than handling it a little bit at SHOT show '08. I haven't seen one used at any of our matches out here.
The AR-30 is a very economical gun (as is its big brother the AR-50), but I would not characterize it as very "field-use friendly." For shooting from a fixed range, it's a fine gun and reportedly (from a shooting buddy) is more accurate than one might believe from its skinny barrel.
The TRG-42 is a great deal value/price wise, just watch the accessories' prices! For a serious and proven factory 338LM rifle, it's probably the cheapest way into a very high quality gun.
Don't overlook the .338RUM as the "poor man's .338 Lapua". It duplicates the Lapua ballistics, and you should be able to buy an off the shelf Remington 700 in this caliber.
Hope this helps,
Zak