and of course - after copper - the whole tier struggle is - quite a lot less existent....
Tin mark-ups will buy every handle and then some - iron will buy stacks of them and then some - Steel+ will buy every handle in stacks and guards too, as much as you want to keep stock and then some
By iron though, you could get all fancy, or you could just say "dun care" and go stock up on 100$ of common 1h and 2h grips (1-2$) at this point, the handle and guard - mean nothing for the sale, 10000-30000 vs.. what 10030-30050 at best? - or it could just be 10001 and 30005 - or something along that. makes almost no difference in profit.
but like I said, after iron - The main reason you struggle with copper - is gone.
Copper can barely afford to replace itself - let alone another ingot or progress.
Steel can replace every handle 10x over, and every guard, and with a decent leap of progress to another ingot. - as well as replacing every one ingot you used.