There are frequently comments here about "spotting your shot" and managing magnification to achieve this.
There is of course a spectrum of what "spotting the shot" looks like, and achieving different points on that spectrum requires different approaches.
I shoot a lot (hundreds-1k+) of animals per year with a .223, usually from 0 to 500 metres. If I am shooting groups of animals and wish to be able to locate the next animal rapidly, I will frequently use lower magnification - 6-8x for a wider field of view and faster transition. However this doesn't allow me to see the actual bullet impact on the animals very well; I can see the effect of the impact but not the exact location. To see this with a .223 at longer ranges (400+m) I usually need to be up in the 12-18x. At longer ranges with the .223 I like to see where the bullet has gone in to know that it's good as follow-ups on a poor shot are more difficult.
Seeing a miss in the dirt, or the general effect of the shot on the animal, usually requires less magnification.
A larger bullet makes a more obvious impact, but conversely is harder to watch through the recoil.
There is of course a spectrum of what "spotting the shot" looks like, and achieving different points on that spectrum requires different approaches.
I shoot a lot (hundreds-1k+) of animals per year with a .223, usually from 0 to 500 metres. If I am shooting groups of animals and wish to be able to locate the next animal rapidly, I will frequently use lower magnification - 6-8x for a wider field of view and faster transition. However this doesn't allow me to see the actual bullet impact on the animals very well; I can see the effect of the impact but not the exact location. To see this with a .223 at longer ranges (400+m) I usually need to be up in the 12-18x. At longer ranges with the .223 I like to see where the bullet has gone in to know that it's good as follow-ups on a poor shot are more difficult.
Seeing a miss in the dirt, or the general effect of the shot on the animal, usually requires less magnification.
A larger bullet makes a more obvious impact, but conversely is harder to watch through the recoil.