I HATE being lumped in with the bean counters, but I had the same problem in 1992 when I took office....I had deputies carrying 38's, 9's, 357's, 40's, 44's, 10mm, 45's, and without a doubt I am missing something.
They had to buy their own ammo, so I budgeted money for ammo at first...quite frankly, even with a small office it was a logistical nightmare...
SOOOO, we bought 40 caliber Glocks (their overwhelming choice) 22's an 23's.....
Since 1992, we have authorized and inventoried various other calibers, such as 9mm and 45ACP....along with 12 gauge buckshot, 5.56 and 7.62.
NOW, we are going back to the future, and have rewritten our policy to include authorizing other weapons in other calibers, however, the deputy has to provide his or her own ammo....such as my M58...I have to buy my own 41 mag if I want to qualify with it (and I will this month)