It looks like you inherited these boxes of ammo. The price sticker is a dead give away that these boxes are older.
From the looks of the boxes the green Sierras on the left are probably .357 mag., because of the height of the box. The box of Hornadys on right is probably .38 spec. Check the head stamping on the cases around the primer to be certain.
I don't know your level of knowledge, but do not load the .357 mag. into a firearm that is labeled and designed for .38 spl. ammo solely.
JHP = Jacketed Hollow Point
JHC = Jacketed hollow Core, which is much like the Hornady Guard Dog ammo. Think of it as a JHP encased in a Full Metal Jacket.
Go to www.sierrabullets.com
and lookup the "Sport Master" bullets for an explanation.