in threads when guys speak of doner rifles , what calibers make a good doner rifles , do you get the barrel rechambered and re-rifled , or screw on a new barrel, as in over thankgiving holiday our local dicks sporting goods had scoped 700 adl varmit specials for 350$ out the door , and every time i walked by the counter , i just shook my head , saying too bad my safe is full , maybe looking for a 6.5 build lightbulb , any info would be greatly appreciated