Large shank vs small shank

AIC

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Is the 7/8 long barrel nut for small shank and 5/8 long for large shank. I have a 338 Win mag made in 2007 and measured the barrel right in front of the barrel nut and I am getting around 1.036. And the barrel nut measures 7/8.
 

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The picture you posted is a Small Shank. Thread size Small Shank is 1.062”x 20TPI, and Large Shank is 1.125”x 20TPI.

And yes, the 7/8” long Barrel nut is Small Shank. Here’s a comparison.
 

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