I have owned one BOSS equipped rifle and will never own another one.Although you can tune the gun to the load,the overall accuracy was no better than a non-boss equipped rifle with proper handloads.The boss also came loose repeatedly, resulting in a change of point of impact.The boss equipped rifles are extremely loud if the standard BOSS is used.A single shot fired without hearing protection while hunting, made my ears ring for several hours.Lastly,due to the fact that BOSS equipped rifles have shorter barrels than non-BOSS equipped rifles to compensate for the length of the BOSS,they produce less velocity than non-BOSS equipped rifles.