If casual I would go with a 223 or the 204,the 308 and 30/06 hurt after several shots,but the smaller calibers don't and I think that would be the determining factors.If you want a gun to target shoot and hunt with then I would choose the 308 or 30/06.If you would ever hunt any thing big,then the 30/06 out performs the 308 with bigger bullets.Just my opinion.Drop-Shot