This quote from DocGKR pretty much sums up why you might want it:
Cheap blasting ammo and the potential for better terminal performance. If you wanted an AR for blasting and hunting it's pretty easy to see why a 7.62 is attractive.Because of the larger permanent cavity and greater bullet mass, the 7.62 x 39 mm JSP’s offer somewhat better performance than the .223 bonded JSP’s, like the Trophy Bonded Bearclaw use in the Federal Tactical loads. These 7.62 x 39 mm JSP loads are a good choice for use against car windows and should also be outstanding for hunting deer and other similar size game.
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