I looked and looked on the wiki on all the BP and INF stuff but couldn't find the BFBlue range.
However, I made a guess as to the range of the BFBlue (not perfect I know, but it's the best guess I have):
SBlue- 6.375
6
MBlue-6.750
22
BBlue-8.250
18
HBlue-9.750
In short, I found all the regular (non-slash) beams in the blue category and calculated to the nearest percentile how much of an increase there was for each new class (seeing that, as the beams get more powerful, there's an increase in range). Then, adding the "percentages" together and dividing by 3, I came up with an 'average' increase of 15%. Using that, I multiplied the HBlue's range (9.750) by 1.15 and with rounding off to three digits after the decimal, my 'guess' of the BFBlue range (in absence of more concrete data) is 11.213
Be easy on me FS experts. I had free time this weekend with the snowstorm up in my area blocking a lot of roads.