The reamer I used from elk ridge seats a 350smk with .300" of the drive band beyond the case mouth to be into lands. I didn't measure the reamer while I had it here but subtracting the interference and a bit of airspace in front of the case mouth, I'd wager there's a .250" freebore section on that reamer. Just fine for most hunting bullets.
I prefer my rifles with longer "throats" and with the 350smk, theres lots left on the table with that length so i cut the throat in mine .3755" dia, .490" depth, with a sharp leade angle. the smk has .550" bearing length, which slides the front of the band just into the top of the leade as the heel leaves the case. I seat them to 4.200", .200" neck contact, .150" slip to the leade contact. I had originally planned to step throat it like the +p/hybrid/bore rider throats that guys are doing, but decided not to with all the talk about erosion. 110gr retumbo/118gr r33 in formed Bertram brass checks 2875fps and no pressure. tight squeeze tho. With the standard rum throat 102 retumbo was showing me where the extractor was located, so I went ahead and rented the throater. working up 7828ssc now. hopefully get 2950. Every load I've tried groups under 1/2" unless I pull one. All my rifles have plenty of leg room and they all shoot better than I can.
