"actual scale" is correct and usable in written English.
It is used to refer to the exact, real size of something, rather than a representation or reduction of that size. For example, you might say "The model was built to actual scale and looks almost exactly like the real thing."
The actual scale of hate crimes is likely to be higher than the number drawn from police records.
General Melchett: "Em, what is the actual scale of this map, Darling?" Captain Darling: "Er, one to one sir".
While health authorities in Africa's most populous country say they have the virus under control, there are fears the actual scale of the outbreak is under-reported.
Whatever the actual scale of these operations may be, there's no question that the environmental damage wrought on the region has been enormous.
Fiscal expansion programmes should therefore be geared to the actual scale of the crisis, not limited by the arbitrary thought that it will be shallow and short.
For this reason relief is usually shown at five, or even 10, times actual scale, depending upon the nature of the area represented.
The Earth is remarkably smooth, when viewed in actual scale, and many significant features would hardly be distinguishable on a map without some vertical exaggeration.
However, the simulated scale-forming potential of planned feed waters could be compared with the actual scale-forming properties of feed waters, as operational histories in desalination systems are already known.
Serve yourself, and settle in at the rickety folding tables and stools, in an actual-scale plywood replica of the original 303 space.
The stabilizing process was verified by comparing the results of simple calculations and an experimental study using an actual-scale Strarch frame unit.
These tests were followed by actual-scale system tests simulating the crashing of air bearings and the influence of contaminant particles introduced into the bearing gap.
