I'm looking at taking two shotgun classes this summer. The ammo requirements are:
"150 rounds of birdshot, 50 rounds of buckshot, and 15 rounds of slugs (quality ammo recommended for patterning)"
and
"200 rounds of birdshot, 50 rounds of buckshot, and 15 rounds of slugs (quality ammo recommended for patterning), 50 rounds for handgun"
I got a message through to the instructor and asked about high-quality SD ammo (Federal Flite Control, Critical Defense, etc.), and he responded that we would use the "good stuff" only for patterning. This leaves a bunch of ammo for training.
What do people suggest? I think in the past I've heard @TCinVA say that Winchester AA birdshot is good for training, and I think @167 mentioned S&B 9-pellet 00.