A retired FBI agent told me about the nightmare he had ordering ammunition for his field office. The Bu authorizes a wide variety of firearms. Ammunition needs had to be projected for 9mm, .40, .45, .38, and even 10mm. This was in addition to the varied shotgun, SMG, carbine, and precision rifle needs. Overall, this must have been a real pain in the cuff case.
As it is, we have sixteen 9mm handguns fielded in our fifty officer agency. Our transition plan put the .40's in the hands of patrol officers first. The 9mm's are assigned to admin, detectives, and a few other stragglers. Most do not shoot regularly, but we need to anticipate what ammo needs they will have.
We did finally get the .380 SIG 230's previously issued to detectives who wished them off the street. Be safe.