Mine is the later version 455, Have not found a better round for semi-urban chuck shooting. The .17HMR picks up where the .22lr leaves off. Shots in the 75-150 yard range are right in it's wheelhouse. That little 17gr round hits like a hammer. Big old chucks hardly quiver - maybe a tail flip or two and it's over.
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A true sportsman counts his achievements in proportion to the effort involved and fairness of the sport. - S. Pope