Chuck, Ed, I respect you both for your knowledge, and don't like to see you unnecessarily working each other up into a lather. I therefore propose the following compromise - which I thinks covers both your positions:

If you know that your rifle WAS actually manufactured to CIP or SAAMI standards, then it is a very good idea to check the headspace with the appropriate set of gauges.
If it was NOT, I suggest you follow Ed's method, as it allows you to sort out the "possibles" from the "hopeless" quickly and cheaply.

To avoid even touching the fringes of the Enfield headspace minefield, I suggest you take a look at the Carl Gustav, a.k.a. Swedishicon Mauser. We are fortunate in having a real expert on these forums, known as "Dutchman", who has covered the headspace topic re. Carl Gustav in convincing detail. Look it his website.
If you take a perfect Carl Gustav to a gunsmith and he pops in SAAMI gauges, he will tell you that the rifle fails the test.
The rifle is fine, but the gauges are wrong for a rifle that was NOT made to SAAMI standards.

Patrick