Just saw on my local news where many LEA's are having trouble getting ammo for their Officers to train with. Here's my answer to this problem.
There are many semi-auto, C02 powered pellet pistols that look like and are the same size as the real deal. Why not simply spend some money to get these air pistols to use for training to keep their eye sharp and mix in a bit of live fire with their duty weapon as ammo permits to keep up with the recoil and feel of their real guns too.
This would allow them to conserve their ammo yet still shoot quite a bit because pellets and C02 is relatively cheap when compared to duty or even practice ammo.
Any LEO's out there who are having problems getting enough practice ammo would do well to give this a try so they can stay sharp without breaking the bank or depleting their supply of duty and training ammo.