Most LE ranges in the U.S. are 50 yards.
Our agency qual includes 10 rounds from 100 yards. Using different ranges all over the country we solved the logistical issue by using a 50% reduced size target at 50y to simulate 100y when 100y is not available. For some reason I usually shoot slightly better on the standard target at 100y than with the “mini-me” target at 50y.
Primary use, barrel length and ammunition all factor into zero selection.
The issue is you are supposed to verify your 50/200 zero at both distances…
We went from 100y zeros to 50/200y zeros when we switched from 14.5” guns to 11.5”.