Or the general recipe concept revamped, arrow/bolt heads (base material + base material yeilds 6-12) shaft (relatively cheap) + fletchings (2x wings/feathers yeilds 6-12 relatively cheap) yields 33-99 (or 99-297 for higher tier synergy recipes)
Bullets Ingot (base material) + fire sand (relatively cheap) yields 33-99 (99-297)
So in the case of adaman bullets beyond the fact that they are needed for high level smithing there is also a yield inequality or imbalance, generally with bolt/arrow heads they use 1/2 expensive/rare base materials but an intermediate syth stretches them out to 6 more syths as opposed to the 1 syth you get from bullets.
So to put that into perspective arrows can be produced at a 6:1 ratio by comparison using the recipes alone, now this doesnt even take into consideration that adaman ingots are already more expensive then most arrow/bolt recipe components (well even if you are talking about adaman bolts still 6:1)
My solution introduce shell casing's (shaft type intermediate and generic go between for all bullet recopies = arrow wood, perhaps add an alternate type cannon shell for use with a neo culverin type weapon and syth able cannon shells!) add an intermediate bullet/slug syth that stretches ingots out for bullet syths, could have a lower overall yield to keep bullets more expensive (nq yields 3 vice 6 or recipe requires 2 ingots but still yields 6)
Also considering that adaman is in high demand for crafters as well perhaps ontop of this add more sources of adaman.