I have AR uppers in ,22lr, .223 Wylde, and 6.5 Grendel. The one round I will never have an upper for is 300 BO. This is because I personally find the risks of the BO to exceed any possible benefit in my case. The vast majority of kabooms in ARs in recent years involve a BO round getting fired in a 5.56/.223 rifle. I don't like that the design of the BO allows one to be chambered in the smaller bores. The Grendel won't do that, so I don't lose sleep over a possible KB. YMMV.
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"Of all the things I've lost, I miss my mind the most." A. Brilliant
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