Head spacing with only a FIELD gauge.

[tenOC]

Ten, are they also stamped with those same numbers? I guess mine are older than I thought - without pulling them out, I remember them as 1.290, 1.296, and 1.302. - Bob

"...only use the FIELD gauge..." That doesn't actually check the headspace. It only tell you the thing is at less than max.
Yours closing on the No-Go but not the Field indicates it's safe to shoot, but is close to max.
"...My Forster Field does measure..." Headspace gauges do not 'measure' anything. They only tell you if the thing is within tolerance or not.
Graf's shows the Forster No-Go gauge to be 1.296". Not that it matters. They don't list the other 2 gauges.

They're actually stamped 1.290, 1.296 and 1.299, but I measured them with a digi micrometer made in the largest Asian nation and sold at a premium from a very high end tool distributor outlet called Harbor Freight. So....there ya go. China is always right, aren't they?