I had to see if any of that long range pistol and rifle shooting would help me with hand held video, which is another of my hobbies, which is a challenge from a physical positioning and steadiness standpoint.
So, I have an Olympus E-M1ii camera body and a 300 f4 lens and 1.4x teleconvertor. The Olympus camera is a micro4/3 sensor so the crop factor is about 2.0. So the equivalent field of view for a full frame or 35mm camera would be 2x300x1.4 or 840 mm. Hand holding this rig is a challenge even taking single photographs, but video is really a challenge.
There are two modern technologies included in this camera/lens combination that make shooting this setup even a possibility. One is in-body-image-stabilization and the second is in-lens-image-stabilization. Olympus has included firmware in the camera to work the lens and body stabilization together to provide a pretty steady image, even with this long lens.
Here is a video clip showing 30 seconds with the stabilization systems turned off, followed by 30 seconds of both systems functioning and working together.
https://youtu.be/dPLNvbw6Muk It isn't perfect, but portions of the second clip are very usable. This hardwarae is phenomenal.
To me, this image stabilization for video shooters is analogous to red dot sights for pistol shooters at 100-200 yards. The red dot makes it possible for ordinary people to try shots that they would have thought were impossible. The latest image stabilization technology makes it possible to shoot at least a few seconds to a minute of video of wildlife, for example, before taking the time to set up a proper tripod or other support. But, one has to practice each discipline before consistently good results can be expected. Neither is natural and neither is easy.
Don't even ask about following a large bird in flight hand held with this setup, that IS impossible to do well hand held. I actually have a red dot on my camera to experiment with this weekend, however. It is very difficult to find your subject in the viewfinder when the subject is moving. Sound familiar?
Joe