Hi all, I have a spare Omark 44 action, (.308W bolt face) which i am considering building a dedicated .30cal castboolit varminter on. I am thinking of portability also, so was thinking of a 20" bullbarrel, and i want to be able to shoot a variety of castboolits thru it out to about 200M. What i am not sure of is cartridge .308 or .30/06 and the best twist rate. I do like the longer neck of the 30/06. Suggestions??? Larry Gibson hello???