The firearm rules by Ken Hood are probably more real-world accurate, but without more examples, they aren't all that useful. I'm not going to work though the design features to see what comes up, I want examples ready to use.
Privater Press published a free 2-page pdf called Firearms Basics v1.0, which closely resembles the above chart. Here's the sample pistol for comparison:
Just to note: NPCs with awesome weapons skills probably have specific feats that go with them. It's not just the weapon.Small Pistol: This weapon’s main virtue is that it is easy to conceal, being only 9 in. long. 400 gp, 2d4 piercing, reload 1S/DC6, crit
19–20/x3, range 40 ft., 4 lb.