[DRG]

and 60 is acceptable for a DF infantry gun or a weapon used in an AT role that is intended for direct fire only.

And yes there can be two ( or more ) versions of the same weapon / gun for different purposes. It's done many times in the OOB's. 66, 79 and 80 are all 152mm M-10's in the Russian OOB but we do NOT give direct fire only guns the range indirect fire guns get. That has been true since day one and it's not going to change

In the above example, 66 and 79 are used by two versions of the KV-2. One is the DF tank and the other the indirect fire-capable SP arty unit. 80 is the version used by the regular arty. There is no difference between 79 and 80 except the name because two decades of dealing with nit picking over minutia like this has taught us that using a "FH" version in a tank generates "error" reports.