Dice probability calculator gives an almost 100% probability of scoring 15+ on 6 d10 dice. Of course, that is not a direct correlation but the closest I could approximate to getting to 50% hits for a unit of 6 firing using d10s with hits on a 5 (3 x 5+ = 15+). So, that is short range. Long range hitting on d8 (3 x 8+ = 24+) is still in the 91% range. Again, not a precise measurement but does lean towards the 'lethality' of hits. So, maybe an adjustment to the "to hit" number is in order. Especially given how unreliable shooters scoring any hits is generally with fire arms, and especially with pistols. Hollywood notwithstanding, most people are crappy shots and quintuply so when shooting at someone who is firing back - including people highly trained in handling firearms (various articles read on the matter over the years)! And, yes, I know some people are marksmen with both pistol and long arms. Not most folk.
Any math wizzes paying attention feel free to provide more pertinent numbers.