Actually, “point blank” is a distance between which the rise and fall of a bullet does not exceed some certain specified vertical dimension. For example, “PB range of a 30/06 150 grain bullet at 2900 fps on a 6 inch target is 0- 320 yards when sited to hit 1.5 inches high at 100 yds”. The meaning is that the bullet will hit the target somewhere between the top and bottom any where within this range.
You mean “close quarters” or “contact” ranges in your posting.
Terms matter.
Per wiki:
“In popular usage, point-blank range has come to mean extremely close “can’t miss” range with a firearm, within four feet of its muzzle at moment of discharge yet not close enough to be a contact shot.[1]”