It all depends on the twist rate. I had some 62 Military pulls given to me by a friend who has a slow twist rate in his Remington 223. They were key holeing badly for him at very short range.They do fine in my Savage with a 9-1 rate. My advice would be to load a small number(5) and try and see how your AR shoots. The early AR as I remember worked fine with 55'S but would not handle the newer heavier military slugs.
SORRY. I WAS NOT PAYING ATTENTION TO YOUR POST. THEY WILL WORK JUST FINE IN YOUR AR.
That's a pretty good rule of thumb. But like any other "rule", there are certainly exceptions. I tried to get some 75gr Swift Scirocco's to shoot from my 1:9 twist .223, without success. Yes, I could get them seated to mag length. And yes, they say 1:8 twist required right on the box. But I heard that some 1:9's would shoot 'em OK, any others wouldn't, so I thought I'd give 'em a try. Nope... nothing but pretty little keyholes all over the paper.
But, no... 60 grainer's certainly wouldn't be an issue.
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