Hey dipstick, take a reality check!!! In the land of the big sandbox, for long range shooting they are issueing calibers such as 7.62 NATO, .338 Lapua and .50 BMG . They are not issueing poodle shooters or gopher guns for that tasking.
Just because you were a patsy and choose to believe some WANNABE that bragged about some phoney body count, doesn't mean that we are all as gullible as you are!!
Heres a simple trial for you, get 10-3/4" steel plates 1'x1' and put them out at 500 yds. Get a competent marksman (not yourself), shoot 5 with a 5.56mm , shoot 5 with a 7.62 NATO. Guess which 5 will go down?