I know of that, its Notes on German Shells 1918 Second edition. (Or first)
And your assumtions is completly wrong.
Gr. Is Granate (Grenade) and m.P. is mit Panzerkopf (with AP head.)
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This is not my assumption, this is this own document’s abbreviation table.
The document lists Granate as G., not Gr., and P. is listed as Phosphor. Even if this was P. (P.), that would be Pulver.
Granate mit Panzerkopf would make sense, but this document lists the abbreviations as Gross and Phosphor.
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Probably some translation error.
m. P. = mit Panzerkopf
If Gr. meant large it should be in lower case letters
→ gr. for gross
Oh wait true you do make a good point.
That also lists m.P. as mit Panzerkopf, your 3rd picture
11th line.