My rifle parts have finally arrived and I'm ready to have my gunsmith put things together. I have a Brux 24" sporter barrel in 6 mm w/ a 1:8 twist, and it will be attached to a Defiant action with a detachable box magazine (accuracy international magazine). My main use of this gun will be for varmint hunting and some possible Antelope. My plan has been to try a 6 BR AI. I would like to know if any of you have had any experience in using lighter weight bullets like in the 58gr to 87gr range. If so, what powder are you using, and what velocities are you obtaining? Also, has anyone had success in repeaters when using the AI magazines with the Primal rights followers. My other thoughts have been about going to the 6mm Creedmoor or possibly the 6 Dasher. Some have warned that they might feed better. I not only want an accurate round, but I want something the functions smoothly. Any pertinent experience would be appreciated.