The value of .65 seems wrong for the snub-nose PPC. I recognize that it is the value in the book, but the math seems wrong; .65 is the average of its medium and long range damage values. This doesn’t take into account the advantages of its extremely long short range. Short range of 9 hexes is easily medium range when converted to alpha strike, the value should reflect that.
The value should be ((10+8+5)/3)/10=.77 An argument could be made that the range is effectively a targeting computer or pulse modifier as well. If that’s the case it becomes (((10x1.1)+8+5)/3)/10=.8
As for the short range you forgot the light PPCs minimum range. Per the rules as written I was wrong entirely, thanks for your time.