Often times in cases like these there is often someone high up in the food chain that prefers one brand of gun or one cartridge to another. They may or may not actually know what they are talking about, but they have the authority to make such changes so they force a switch to what they think is best. The majority of police aren't gun people and as long as whatever the new gun is works and isn't impossible to shoot, they just go with the flow.
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"Si vis pacem, para bellum" - If you want peace, prepare for war.
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