Hi. newbie here and a bit of 'gun nut' myself I'd like to weigh in on this topic. (it caught my eye right off). He's my take on the whole Revolvers vs. Automatics issue, which you might want to think about when deciding ICly what sort of firepower your character thinks is appropriate.
Generally speaking: (there are always exceptions and devilish details)
Revolvers (compared to automatics) are: simpler to operate and maintain, easier to gain competancy shooting, more easily customized to varying sizes and shapes of hands, more catholic in ammunition choices, withstand neglect better.
Self Loading Pistols (compared to Revovers) are: More compact and space/weight efficient, Easier to MASTER, simpler to manufacture, Can carry more ammunition and reload more quickly, withstand ABUSE better.
Revolvers are a better choice for someone who doesn't wish to spend a lot of time maintaining their firearm skills and infact tends to leave their firearm collecting dust against an unexpected and dire need.
Automatics are the tool of the person who maintains and uses his pistols with the care and frequency that a professional mechanic uses his wrenches.
IMO.
GARF
ps. The above is a necessarily simplified precis. I didn't want to lecture you at length. I hope this helps non-firearm savvy players make more... Icly interesting choices. I invite any firearm savvy persons who disagree with me to discuss the issue. Also, I'd be glad to further express my opinions on the subject in response to any questions anyone may have.
With one caveat: they are my opinions. I like to think they are backed up by my readings and personal experience on the subject but said experience is hardly what I would call expert.