I am about to pull the trigger on a new HW 97. Those that already own and shoot this rifle, question: Is it ready to go out of the box, or should it be tuned, such as an aftermarket spring and such? I am getting it in .177 with possible use towards field shooting. Having had a AA TX200, and a Diana 54,I know it is a beast, but I have two PCP's for pest elimination. Any help would be appreciated, pellets that really work in the 97.