Idea... How about load 2 types of missiles for Ashuluk, Ustka? (3 x 5Ya23 + 3 h B-...) ? It should be good for creating scenarios in future also... In Hungary, the rule was that, each battery can have only one type of missiles.
All the batteries West of the Danube were equipped with the V-759 5Ya23 (Guideline Mod.5), while everybody else got the less capable V-755U 20DSU (Guideline Mod.3).
Wonder, how could you select between 2 types of missiles (3+3) with the Volhov.