the wins are the smallest diameter and the hottest standar primers. They will fit loose the soonest even after 2-3 loading and because of the hotter flam will have larger Vel spreads but they do work. I suggest you use the Wins first while your cases have the least number of loadings. Then goto the CCIs after that get WOLf or CC Br4 Rem 7 1/2 These tend to produce the best flame for the 6.8 creating the lowest vel spreads.