1 - Practicing to stay proficient.
2 - Minimum store for harder times.
3 - Do these numbers apply to all calibers you own?
For me: Handguns = 100 rds/Mo. practice with various calibers and 1000 rds min. storage in primary caliber.
AR = 30 rds/Mo. practice and 1000 rds min. storage
Hunting = 10 Rds/Mo. practice and 500 min storage
Shotgun = Depends on your situation and interests (hunting, survival, self-defense)
This is a good answer.