Ive had 2 BCA grendel barrels. First one was horrible with any ammo used. They replaced that barrel under warranty and the second one I dont have enough rounds through it yet. That being said, its not nearly as accurate as my 5.56 Aero Precision AR. Ive played with 8208xbr powder with ELD and SST 123 grain bullets with so so performance.
That was my brother's experience as well...first couple barrels shot terribly (4-6" @ 100 yards on an indoor range, with both factory ammo and handloads). The 3rd one shoots close to an inch with most loads. He had the same issues with a couple Valkyrie barrels and gave up on the caliber, opting to have them send him a high-twist 5.56 barrel instead, and it's a tack driver. I got lucky with my first Valkyrie barrel from BCA and it shoots pretty well. Still doing load development for it, but it shows promise. A lot of people have had some bad luck with the Radical Firearms uppers/barrels and well, and my lone example has been a great shooter, consistently around .75 MOA. My experience with the budget-oriented barrels is that it is very "hit or miss", pun intended. Sometimes you get lucky and get a shooter, other times you get what you pay for. I will say that BCA has been very easy to work with when a barrel didn't meet expectations, which says a lot about their customer service.
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