Didn't see anything about this so maybe my Google-Fu is weak today, but I'm at standing start planning/building my ammo dump and trying to get up to speed.

If we assume a basic "building block" for any given caliber is a thousand rounds of a Serious Work load, how many "training rounds" do you keep in your stockpile relative to that thousand? Also, if you keep stocks of "special purpose" rounds like Mk 262 alongside your "main load," what all roles do you keep the specialists for and how many of each?

As a start, I was thinking something like 250x each Mk 262 for long-range SHTF and M855 (only "maybe" on the M855, not sure if it's even worth having), 1000x each of FBIT3/SBCT3 or 64gr Fusion/Gold Dot and a "training counterpart." Any other special roles I need to consider, or suggestions to revise this ratio?