[DRG]

I found a XLS spread sheet that I had done up when we were experimenting with different ways of rating HEK and the final version on the page matches your chart for Guns/Howitzers almost exactly. So it looks like you have that OK

30-39mm 1
40-49mm 2
50-59mm 3
60-69mm 4
70-79mm 5
80-89mm 7
90-99mm 9
100-109mm 11
110-119mm 13
120-129mm 15
130-139mm 17
140-149mm 19
150-159mm 21
160-169mm 23
170-179mm 25
180-189mm 27
190-199mm 29
200-209mm 31
210-219mm 33
220-229mm 35
230-239mm 37
240-249mm 39
250-259mm 41
260-269mm 43
270-279mm 45
280-289mm 47
290-299mm 49
300-309mm 51
310-319mm 53
320-329mm 55
330-339mm 57
340-349mm 59
350-359mm 61
360-369mm 63
370-379mm 65
380-389mm 67
390-399mm 69
400-409mm 71
410-419mm 73
420-429mm 75
430-439mm 77
440-449mm 79
450-459mm 81

Some of you rocket specs match the OOB's but others do not and that may be explained as research modifications where information points to higher or lower numbers than the chart which is just a starting point.It's been almost four years since we dealt with this. Some of the details are a bit hazy

Don