From pictures of actual knives, it seems that the Orange Harvest Pocket Worn 6165 has a full grind, though I can't tell if it is a full flat or a high hollow grind. All others I have seen have the saber grind (what you are calling half grind).
So it does seem to depend on which handle material you get. Which is weird, but not unheard of with Case. Examples: bone handled Sod Buster Jrs are full flat ground but the black synthetic is a really thin high hollow ground.
Also, the Pocket Worn Old Red version of the 6318 Med Stockman comes with the regular clip blade (like you find on the Small Texas Jack) but every other 6318 that I have encountered comes with the slim California clip.
You could call to verify before buying.