Back about 45 years ago the only source I had for magic mushrooms was liberty caps from farmers' fields. I found 40 of our local sized specimens was a bit more than I could handle and that even thirty was a strong dose. Fifteen didn't really do it for me. I sometimes ground them in a Krupps coffee grinder and hand packed them into 00 caps. I found fifteen would fill a cap if packed as tightly as I could get them. So, the problem I had with capping them was being able to do a fine adjustment on doses. It was the difference between sticking your toe in the water, or going over the waterfall.
I was told not long ago, by someone who was a kid back then, about something which I had completely lost down the memory hole. It was a Christmas party where all the local hippie types and some of the cooler pillars of the community were present. I had a bunch of those 00 caps to bring to the pot luck. Our hostess put them in a bowl with some holly sprigs around it on the table with the beer, wine, pot, and munchies. So, the ex-kid tells me how about five or six of the young teen boys helped themselves to the goodies, eating two each and going high on the Balls' Scale. Fortunately, one of the neighboring parent couples were at the party, leaving their house free of adult supervision, so this magic gang could take refuge away from the gathering which was including all their parents.
Anyway, I have been assured from those boys, all grown up now, and mostly with kids of their own, there were no hard feelings and I am still revered for that contribution to their delinquency.