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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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I only own wood-burning, steam-powered vehicles for this very reason.
The risk of fuel system and engine damage are just too great for diesel and gasoline cars, when accidentally filled up with the wrong fuel.