One wrong turn and you are only about 15" at 100 yds. I can not really call that miles! It might not be enough to miss but would be enough to wound big game. Plus, bore sighting is definitely not an exact science. When I see how many barrels more or less bent I had through my lathe and having sighted in a lot of rifles you sometime get some surprises!
And bore sighting in the middle of the bush while not impossible is not the easiest.
Friwi
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