There is some confusion of the term "Sporter"... on the Dlask website... there are two common uses for the term "Sporter," both relate to barrels... there is the Sporter chamber and there is the Sporter contour... the Sporter chamber refers to a looser more generous chamber which will function with a wider range of ammunition... the Sporter contour refers to a lighter more tapered barrel profile... with Dlask barrels, they use "Sporter" to designate the larger chamber... they use "Xtreme" to designate their tighter match chamber (modified Bentz Match)... Dlask recommends Winchester, American Eagle and Federal match ammo in the Xtreme (but other match ammos will work; we have had good luck with Wolf MT and SK Standard Plus)... The Dlask Sporter chamber will function with most ammo's, including CCI SV, Green Tag and Mini-Mag's... but these will "sometimes" require a breakin period... our latest builds required a brick through them before they smoothed out in function with MM Solids. It should be noted that Dlask recommends against Velocitors or Stingers (and other Hyper velocity loads) in any of their chambers... there may also be problems with CCI Segmented. In our Xtreme chambers we stick with Wolf MT and CCI SV (which function perfectly after break-in and tuning)... In our DAR22 Sterling builds with the Sporter chamber we have had best accuracy and function with Mini-Mag solids.