You must remember that these stats are not the only things affecting a conscript/grenadier skirmish. There's also cover, positioning, the chance that shots that roll a miss will still hit a model, not everyone is shooting at the same model, who shoots first, models jumping for cover, models crouching, etc., etc., etc.
Especially Guards rifles will cause grenadiers to hit the dirt or jump around for cover.
There's so many other random factors that I don't really think these bulletins have such a huge effect anyway.
