He was budgeted for a Barrett; why didn’t he simply but THAT...?
50 BMG tracer rounds would be hard to come by, but...it’s miles better than a .308
UN Ammo in Phoenix has it for $2.90 a round. 100 rounds of .50 APIT sells for $315.00 including shipping. Add $20.00 if you want it linked and in a can.
http://www.unammo.com/#985
50 Cal Barrett, maybe with armor piercing, but standard 50 cal ball, maybe pop a dent in it.
Armor piercing is near impossible to get because its only seen in war zones.
Range rules in the USA make it near impossible to use and the cost is prohibitive so its not wasted on training.
I'm sure a few made it home from Iraq in the bottom of someones foot locker though.