Concerning artilary shells we need them all
-Ordinary artilary shells with +150 m Cep
-artiiary shells with Basic guidance kits with 50 m Cep
-artilary shells with laser Guadiance kit with <10 m
-artilary shells with INS+GPS < 10 m
For last two guess they are not an easy task dont know tip of an artilary shell should be not the best spot to place delicate electronics and actuators for instance the initial velocity of Excalibur is 827 m/s
MKE is not the old MKE and has done excellent jobs recently but IMHO the last two types of artilary guidance systems are not their field
note:
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MKE solution looks very similar to M1156 Precision Guidance Kit with exact CEP value of 50 m and it is safe to assume that MKE's PGK should be using GPS as well.
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https://ndiastorage.blob.core.usgovcloudapi.net/ndia/2008/fuze/VABurke.pdf
According to manufacturer (NG), the current CEP value of PGK is less than 30 meters. (Probably around 20-25 meters)