A) What are bullets for? B) Does GT allow stacking ingots like in terrafirmacraft? I saw this in one video (Bears Den Basic Titanium) If yes then how to do it?

A) Currently not really useful, but I plan Stuff with them. The GTWW Addon uses them though. B) That is the “Stacks-on-Stacks” Mod. It is horribly coded and annoying, I really need to add its Functionality to GT6 someday.