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Re:At 4.4 miles, Wyoming team sets new rifle shot world record by wahern on Friday September 23, 2022 @10:00PM (#32959121)
Smart bullets exist: https://en.wikipedia.org/wiki/Smart_bullet

Here's a live-fire video of the EXACTO: https://youtu.be/YoOaJclkSZg

All the available information is several years old, now. I figure either the EXACTO (or successor) has secretly been deployed, or it proved impractical.

Re:At 4.4 miles, Wyoming team sets new rifle shot world record by Animats on Sunday September 25, 2022 @02:02AM (#32969296)
It may have fallen into the category of weapons too big to lug around, and inferior to vehicle-mounted systems. That's happened before. About 10 years ago, the USMC was trying out an "automatic mortar". This accepted fire direction like artillery - forward observer designates target, data is passed to weapon, weapon duly clobbers target. Worked OK, too heavy for infantry, and there are vehicle-mounted systems already deployed which can do that job.