This would be round 15 - that´s a difficult one as this pellet is probably not available in the US so a little tip to stay fair: look at the country that produces the best pellets another company there makes these cheap and horrible ones.
Your right its the benjamin's your pellet might be theDiabolo Rex. but they don't have the groves going down so maybe not . diabolo-rex-200-ks-polgulate by myrideklx650, on Flickr
O.K., I´ll resolve it. I thought somebody might have visited and knows ´em. You would certainly never forget those. They group at about one inch - but at 10 yards lol. And you get super dirty hands if you handle just three of those - so... if you ever visit, rather stick with JSB - if it´s from Kovohutě Příbram, forget it, even if they are dirt cheap I saw someone´s photo here with a tin of "Lux" match pellets from the same company.
@125 sniper: not a bad guess. The Rex diabolos are from Slovakia.
Let´s make it easier and stick with the better known pellets: what is this one?