maximum range vs weapon accuracy; warhead vs penetration

[raginis]

Is there an effect? I'm playing as Iraq around 1991, and I have three RPG weapons to choose from:

Name Acc Leth Pen Range Warhead
RPG-7 5 4:0 33 10 5
RPG-16D 5 7:0 30 12 3
RPG-18 5 4:0 38 4 4

The best penetration is for RPG-18, but it's also by far the smallest range. I don't intend to fire these weapons at their maximum range, so a range of 4 hexes would actually be perfectly acceptable - unless, of course, the accuracy calculation takes into account a weapon's maximum range, and gives a bonus when firing at targets well within the max range. I could not find this info in the manual.

Second question - the manual does say that warhead size affects damage and penetration (at least for HEAT weapons). But - how large is this effect? Here the difference in warheads among the three RPGs is significant - 2 points, or 66% percent if the RPG-16D is taken as the base. RPG-16D already has the least penetration, but also the longest range. But, if max range doesn't matter, but warhead size matters a lot, then RPG-16D would be the most useless weapon of the three.