Two rounds of Corbon gr300 damage my RRA458 upper!! RRA tech said he did't know what's the problem. Im not the first person that is having problems, im sending it back Monday ! No telling how long it will take! He did tell me it only people shooting Corbon gr300 jhp. "Tell everyone shooting a RRA 458 upper to stay away from it",untill they fix the problem. He said cor-bon and they are in contact trying to find a soultion wether the ammo, upper or both together!!!! deer season starts tomorrow
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