I've been interested in ordering an extra barrel for one of my savages in more of a "wildcat" type round. One based on a .223 Rem case is particularly attractive to me for the ease in obtaining brass and such. The two cartridges that most immediately come to mind is the 6x45 and 300 ACC. Then, I came across the 6.5 TCU, but haven't found much info on it outside of silhouette pistol loads. Why the lack of info? Judging by the load data for 10 & 14" barrels, it seems like it would be promising in a 24+" barrel and an appropriate powder.