Johnny,
Are you currently a reloader or just looking into starting? If you are currently a reloader, where are you getting load data from? I believe every good load manual I have (Sierra, Hodgdon, Speer, Hornady, Lyman, Oregon
Trail) list bullet diameter for any given cartridge as part of the data. Some of the powder manufacturers I've checked that provide data on the internet, Hodgdon (Hodgdon/IMR/Winchester) & Accurate Arms do list bullet diameter but Ramshot, Alliant & Vihtavuori do not.
Wikipedia has a decent page that lists bullets and then the calibers and other information.
Hoss
__________________
I ain't as good as I once was, but I'm as good once as I always was
Kahr PM-9 / Sig P-245 / Para NiteHawg / Walther PPK / Beretta Tomcat / Ruger LCP
BDA 380 / Taurus 85 / Kel-Tec PF-9 / Am. Derringer 357 / Sig Sauer 239 SAS / Walther PPS .40
NRA Life Member
My Web Site