1. A modified will be appropriate for most mid-range clay target presentations. For close range targets, like skeet, a less constrictive choke is appropriate. For longer range targets, like handicap trap, a more constrictive choke works best.
2. Avoid steel shot when not mandated.
3. Shooting sabot-type slugs with a smooth bore (any choke) is typically a waste of money.
4. I use a lube specifically formulated for choke tube threads.