I am currently planning a custom build to be done over the winter.The rifle will be used for target shooting at the local range out to 500m,perhaps on a coyote hunt,and maybe even for pronghorn.I am thinking a Surgeon,Stiller,or Barnard action,a Mcmillan stock,likely an A-5,and a premium barrel,perhaps another Kreiger.I have not yet decided on a chambering,at this time,I am considering the 6mmBR,243win,and 260rem.Which chambering would you pick for this rifle?Who would you be considering to build such a rifle?So far,I am considering Alberta Tactical Rifle,but I am open to suggestions.