I came across a box of old targets while cleaning up today, and found these from a patterning session last year:

- 5 yards
- Rem no8 birdshot 5yds.JPG (86.3 KiB) Viewed 6634 times

- 7 yards
- Rem no8 birdshot 7yds.JPG (101.6 KiB) Viewed 6634 times
If you can't read the notes very well, these are Remington #8 target loads, 3 DE, 1200 FPS (nominal), 1&1/8 oz of shot; fired from my 18.5" cylinder-bore barrel at ranges of 5 & 7 yards. The rings on the targets are spaced 1" apart.
This is why I won't use birdshot for HD. For all the noise about birdshot being "effectively a slug at HD ranges", it spreads fast from your typical defensive chokes, and it doesn't take much for each one of those little pellets to be on their own. It would suck to get shot, no doubt about that, but this stuff is
not a reliable way to stop someone fast.