[Super Sneaky Steve]

Hey guys. I've been realoading metallic cases for a while now, but I've never giving shot shells much thought till now.

I'm looking to buy a Lee Load All 2 to get started, but I have some questions about how to load these things.

First, how do I know what kind of shell I have?

I bought some Winchester White Box 2 3/4" shells, Looking on Hodgdon's site they have data for Winchester Compression Formed AA & HS Type Plastic Shells and Winchester Polyformed Plastic Game Shells.

Which is which?

And from what I'm getting from youtube, the exact weight isn't important and the machine will throw the right amount? Seems weird to me.