The military is currently working on an intermediate round, as the 5.56 does not have all that much enrgy to play with. At extreme range it loses power, where 7.62mm DMRs come in. Of course I have heard AR fans say an m4 with an acog is a better DMR....yes, really...And even thin obstacles like sheet metal and wood doors have been known to slow the 556 down enough that it isn't delivering enough energy to reliably take down a bad guy. I cant wait to see an intermidiate round, the 6.5 grendel would be good if it didn't jam up so easy.
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