I recently purchased a couple boxes of 7mm Wby cartridges from Weatherby, and the boxes are labeled only Barnes X. Does anyone know if these are Barnes X, Barnes XLC, or Triple Shock? Also, I've heard of accuracy issues with Barnes X bullets? Can anyone shed any light on this? Are they ill suited as target rounds but for hunting, where a 3-4 inch group at 200 yds is acceptable, they're OK? And finally, how many of these all copper rounds can I fire before I need to give my barrel a thorough cleaning. Thanks in advance for any info.