I grew up in a town of about 2000, located in northern MN about 100 miles south of Canada. In the seventh grade a basic industrial arts class was required. Every male that went to this school took this class. Hunting was popular on the Iron Range and required a firearms safety certificate if you were under 16. The firearms safety class was included in the industrial arts class. Everyone was required to pass it. Part of the course required that we shot targets. The school had three gyms. The newest was used for sporting events. The other two were used for boys and girls phy-ed. At one end of the girls gym were two large bullet traps: 4 or 5 point each. Couldn't say for sure, it was a long time ago. They were probably made in the metal shop. 50 feet was marked off on the floor. Tumbling mats were laid on the floor. There was no exhaust system. 22 cal rifles and ammo were kept locked up in the school. We learned to shoot, practiced and passed the proficiency test in the girls gym. The only casualty was the old piano in the corner that caught a stray or not so stray round. I took this class in 1963, age 11. I'd say this will never happen again.