I suspect that this new Hornady 5.56mm 55gr GMX would be a good barrier-blind choice.
http://www.hornady.com/store/5.56-NA...Superformance/
http://www.cheaperthandirt.com/72020-1.html
I'm guessing that it would act similarly to the 50gr load from BH.
I've had very good luck with the new GMX in other calibers so I may give this load a look.
Anyone tried this new load?