"the shizz" is that start of where one would begin to wonder if it was serious, and the SHTF and post apocalyptic nonsense.
And the mention of using an ACOG on a 338 Lapua for 1000yards is another.
At first thought it would assume you were BSing or very new too shooting.
Yep, these are the things that show a limited understanding of shooting in general. Because of these, I agree with the thought of getting something smaller. Let me be blunt; you are not ready for a 7mm mag, much less a .338 Lapua. If anything, get started with a .308 (at most) and learn the basics of marksmanship. Learn how to shoot at 100-300 yards, then you can start to shoot further.