150 boxes of .308 at 1,000 rounds per box is 150,000 rounds. I went to my bulk ammo dealer and that round goes for about 80 cents each at a bulk rate. That’s about $120,000 before sales tax, if they paid it.
I bet they could double their money easy in Mexico.
In some rifles 7.62 x 51 and .308 are interchangeable. My civilian M14 will fire both but the manufacturer recommends not using .308 as it may slam fire due to slightly different shaped casings.
My Chinese made M14 does just fine with either.
I just use the cheapest ammo.
If it comes to the point where I’m shooting at local cops
won’t really matter anyway.