Currently, I own two rifles. One is a 30/30. The other a bolt .223.
The 30/30...Even though I have owned it now for 4 years, I have yet to actually sight it in.
I have fired only a single round through it, @ 100 yards, just to see if I could tell how far off the factory setting of the iron sights was (way off).
On the .223, I am an "oddball".
I topped it with a cheap Simmons 3x9x50 scope, back in 2004 or so, when I bought the gun new.
I decided to sight it in, 3" high @ 100 yards.
Didn't really have a good reason. Just how it did it.
And that is how I have kept it, re-checking the "zero" every year.
Now, admittedly, due to health & finances, I have not done any serious hunting in the past 5 years or so.
However, between 2004-2012, I hunted hard. And that "zero" has rarely failed me, if I did my job.
That gun accounted for a few hundred coyotes in it's lifetime. And they were all killed between 30-250 yards. Most around the 75 yard mark.
When they are that close, I simply hold the crosshairs near the bottom of the body. Has almost always put the bullet right in the middle of the vital area.
If I think the coyote is closer to 200, I simply hold dead-on, and pull the trigger.
According to the Nikon Spot-On ballistic calculator...using my preferred ammo, Black Hills 55gr soft points, which travel @ 3200fps, with a BC of .235...my 3" high @ 100 yards, puts me dead-on @ about 262 yards.
And the longest shot I have ever tried (and taken successfully) was measured to be 256 yards. So.....