I have been contemplating the ASC Mags, but if there is an option coming for longer than 2.31, I am all ears. The 69 and 77 TMK's have to really set down in the case to be mag fed. Seems like they are taking about nearly a grain's worth of room from my previous loads. Where the 69 SMK shot really well at 24gns of Varget, the TMK runs better at 23.1gns and sits much further down.