For my indoor 20 yard LSR comps I'm in the process of switching from the 15.9s to the Exact RS which is a little bit lighter than the Express.

The reasons for changing? As I'm making holes in cardboard I don't need to have the oomph of a heavy pellet and the RS pellets appear to be better made and a slightly harder lead. Leastways I'm seeing less skirt damage, and the first thing to highlight a dodgy skirt is how the pellet will load into the Air Arms magazine. The RSs drop in every time.