With such huge power levels theres always going to be inconsistencies. Nam-Ek is
[Show spoiler]blown back by jet machine fire
which to me was done more for visual effect then showing how much it really affects them
A couple of guesses from me on how weapons feel like or would effect Superman
Man of Steel Universe
handgun/machinegun bullets - flick of a finger
helicopter bullets - 1" rubber balls fired at 15mph
jet bullets -
[Show spoiler]Nam Ek's reaciton was overdramatized IMO, in this universe I think the effect is 2" rubber balls fired at 25mph
Cruise Missile - Being hit by 250lb linebacker (confirmed by Snyder)
Nuclear bomb - (not sure if he would survive or not - confirmed by Snyder)
Superman Returns Universe
handgun/machinegun bullets - dust particle
helicopter bullets - dust particle
jet bullets - gnat
Cruise Missile - Rain drop
Nuclear bomb - standing 3 feet from a small toaster oven