I own two 7mmstw's,one 7mmultramag and two 300ultramags.In my opinion the ultramag case works great with .308" and larger bullets but is a waste with the 7mmbullets.My 7mmstw's only produce 50 to 75fps less velocity with handloads,and do it withy less recoil and longer barrel life than the 7mmultramag.