Gunwerks was a good proponent of the 6.5x284 and now they're pushing the 6.5 and 300 PRC. However, in a podcast, Aaron Davidson did indicate their testing showed the 6.5x284 still slightly outperformed the 6.5PRC. I own a 6.5x284 and have had it for 5 years. Shoots like a dream out to 1000 yds...