Most Crosman pellets are junk these days anyway. The Premier line is the only one worthwhile.
Go to Pyramydair and look for JSB or H&N, who both make quality pellets.
The ones in the cardboard box, and that is about it....only to be topped by Gamo pellets. Personally I think Gamo gets a great deal of grief that is not deserved, but when it comes to their pellets most are just a waste of lead.
But the crosman cardboard box those are some good pellets. I just think they let their dies go a little too long.
To the 20 pellets, that is a bit of a boutique round these days, shame as I like it as well, I can see them stopping the sales of them.
The cardboard box ones are no longer sold. They were just called Crosman Premier Light or Heavy. Those were so good because each box of pellets were made from a single die, so they were very consistent. Later ones, in the tins, are mix & matched.
They sold sizing dies in a few calibers and sizes. I have one of them in .177 Thought I had one in .20 but tried to find it awhile back and couldn't....once upon a time in the last century that Beeman sold a pellet swage for 5mm Sheridan type trash can pellets.