Great Waputi,
There are several reasons to begin your sighting in at 25 yards:
1. To get on the paper, centered up and good elevation
2. Easy to check your rifle quickly after travel.
3. Easy to verify with a bore sighting tool or laser
4. Works great for .22 LR hunting rifles
5. If someone is not a really good shot, or doesn't know how well the rifle or ammunition shoots, it saves them time and ammunition to start at 25 yards.
