lets say with

gun 100

commando

sniper

trigger discipline

and a weapon with no spread, like hunting rifle.

someone has done this test?

What effect are you trying to recreate?

I thought steady just reduced your weapon spread to zero, thus making full auto weapons super lethal. Does steady do something other in VATS? With you proposed perk set up you'd have near max accuracy, 95%, with headshots with the limiting factor being the overall range of VATS. You'd either be out of range or 95% head shot, or at least that is what I think would happen.