sorry it's taken you so long to get a reply, I haven't looked at the forum in a couple of weeks.
1. Their range is the maximum shooting range of their battle group. Not sure which page that's on, you'd have to check through the index to find it.
However, you should note that if you detach the shot from a BG the RG remains with the Pike so it will not have the ability to shoot.
2. If you look at the left side of the chart you'll see "Any one of." What this means is that none of those factors affect the shooting of an RG, but it will still be negatively affected by factors outside that section.