The 75 grainers, and the Hornady HPBT will work just fine loaded to mag length in an AR rifle. Buffalo Bore uses the 75 grainers in thier Ultimate Sniper ammo I think. It might be the 77 grainers. Either way several reviewers liked the way they perfomed in thier AR platform rifles.
Again I will recomend trying the Varget since you already have some.
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