Interested to know too. Plan on having a bondo'ed stock duplicated after the season and I've come across Boses in an internet search before.
Seems most stock makers only want to duplicate from pattern stocks they make (as part of the stockmaking process), they don't want to just duplicate and let you do the rest of the work (not enough $ to be made maybe). There also seems to be a HUGE variation in how "tight" the dup is made, and consequently how much work is left after it comes off the machine. I've heard of someone people getting dups that looked like they were carved by a beaver.
I've seen that with other stockmakers who offer semi-finished stocks. Makes me wonder if the stocks they make for in-house work, is cut to much closer tolerances than the semi-finish wood they sell to individuals. Some of the forends appear to have one pass of a 1/2" cutter for the barrel channel, and receiver tang cuts have better than 1/16" left on each side of the inletting.