You know, I was thinking the exact same thought. It would make the references a load easier. It would minimize 'battles' and maximize weapon specific conversation.
Go for it!
But will it be by caliber?
By size? (full, compact, sub-)
Here is an idea of the popularity of some of the above catagories. I just took the sales data, and made it base 1000.
www.atlantisarms.com - popularity
Looking forward to seeing this come about!