The best feature of the 6.8 is terminal performance from a carbine within engagement distances that typical soldiers can effectively make hits (backed by gel tests and supported by deer in freezers). However, a 6mm bullet has been a proven winner in hunting camps too and should perform admirably when pushed to good velocities. Will it have feeding issues though due to the larger shoulder and what is the optimum barrel length? These are things that can be vetted during testing, but I definately still like the cartridge for sporting purposes.