Hmmm, :hmmm: ...NRBH at the momemnt but if the SSRs do not say "HE only" and the OBA chart in chapter H gives that nationality smoke for that calibre of OBA, I would hazard the guess that smoke is available.
:hmmm: :hmmm: The problem is that some calibers appear at different places in the nationality's OBA chart and list different possibilities (e.g HE + : only WP or SMOKE or no smoke, etc.). Some SSR are not always clear.
I do not think the rules restict smoke use (although WP is restricted). Using the chap H charts is not required within the rules (I think), but I have always tried to follow them if possible. Most "modern" scenarios have SSR specifying SMOKE usage.
Robin, do you have an example of an unclear SSR? I cannot remember one of the top of my head, and it seems like such a simple SSR.