Ok so I dont really post here much but I think you guys may be able to help me out. So here is the deal. And yes Ive been doing a metric -----ton of reading both here and on other forums and have just a few questions in case any of you are willing to help me out. Ive been seriously tinkering with the idea of building a 338 of which I want to push to its absolute limits. My goals are as follows. I want to be able to use both the 250 and 300 grain pills from Lapua or SMK. Ideally I would like to push the 300grain pill to around 2900fps Decent brass life Decent barrel life. Ive been doing the comparisons between the 338LM, 338 Norma Mag, and 338 IMP 40* shoulder (which I assume is the 338 Ackley Improved?) I havent been able to find much on velocity, brass life, or barrel life of the 338 Norma but from what I have found, the specs, appears to be very similar to the 338LM but with a shortened case. From everything ive read, it sounds as though my options are fairly limited but wanted to touch base with those of you that know more then me. Also, Ive read of barrels everywhere from 9.3, 9.4, 9.5, and 10 twist. Thoughts? My goal is to see if I can push the 300 grain to 2400 yards. Yes I know its subsonic at that range and will require anywhere from 120-130 MOA but this is a bit of a test for me. No I do not want to go to a 338/408, 375, or 408. I also understand the 338 Edge but from what I can gather, barrel and brass life is less then ideal. It seems as though the 338 IMP appears to have the best brass life, barrel life, and least amount of pressure issues when sending the 300 near the 2900fps mark. Any thoughts, experiences, of suggestions would be greatly appreciated. And before anyone asks, No I dont ever plan on taking a shot at an animal at a distance like that. I picked 2400 as the mark because its just below where the round will be subsonic and will be a helluva challenge. I like challenges.