In a Long action the A bolt is preferable to the short action I own being much smoother. Very accurate rifles regardless of whether the Boss is used or not but with the boss you can tune the rifle to shoot the load you want to shoot and it will shoot optimally. It works by controlling barrel harmonics simplified explanation(keeps the muzzle from whipping around excessively). It is not a gadget like others say if that were the case 90% of the aftermarket crap sold to riflemen fall into that same category . I don't personally want the noise nor would a hunting buddy or guide sitting next to me. This weekend there were a few club members(same family) at the range shooting 338 Abolts with Bosses and they were shooting some incredible groups with factory Federal 210 partition loads. My only gripe was the noise like I said before. You can try the CR system like a friend of mine has and is pleased with the results and the noise level is cut down substantially