I just picked up my Savage Long Range 338 LM on Monday and it snowed 4" that night so I haven't done much except load up 20 rounds and fire off 5 and clean.
I've been at this game for a long time, build my own rifles etc...to compare a 308 to a 338 LM is a bit ludicrous to my way of thinking...not even anywhere very close in the drop department OR the energy end.
You might also review the reason for it's development...it wasn't designed to "take out military vehicles"...only the driver if anything.
While the 338 WM(83gr H2O), 340 WBY(99gr H2O) and 338 RUM(106gr H2O) all have similar case capacities and are all excellent hunters, the Lapua has the highest capacity(depending on who's case capacities you use) unless you go to a full length Rigby case(132gr H2O) or a 338- 378 WBY(124gr H2O)...actual fired case volume Hornady brand 338 LM 117gr H20.
Lapua and Norma brass is always more expensive and superior to the Rem stuff...I didn't think the price of the Hornady brass was out of line considering the size of the case. MOST large cases cost more than Rem 308...I use Hornaby Rigby cases it for my 510 Makatak.
I plan on shooting 300 gr VLD bullets with a BC in the .800's(depending on the G1 or G7 factor) about 2700-2900 fs.
I bought the Savage because of the rifle price and excellent reports on it and I wanted the larger Savage action, 5 round clip, muzzle brake, accutrigger and accustock. I plan on doing a 416 Rigby barrel for it so I can shoot those HI BC 450 gr VLD's also.
While a 308 will do most jobs out to 300 yds...the 338 LM will do it much better...300 yds isn't very far for a hunting/target rifle in any cal from 6.5 up if the shooter knows what he/she's doing.
BUT...If you're only doing 300 yds, stick with a any of a dozen good cals unless you just want a 338 LM like I did...I couldn't build one for the price of the Savage 111FCNS...but stretch out the distance about twice that. Your talking buying a Masaratti to go to the corner" stop and rob 7-11" for a 44 ouncer. Hahahahahahahah