congrats on your browning, that is a fine gun in a fine caliber. i have an a bolt ll in 375 h&h stainless stalker no BOSS and i love it. go to browning's web site click on customer service scroll down to date your firearm and look up your serial # there. as far as the bolt is concerned i think what you are calling a fluted bolt is standard on a bolt guns, mine appears to be what you described. hand load for it if you can, to get the maximum in all respects from your gun. get an extra magazine for it also and a pouch to carry it in. with proper care it will serve you a life time.