Look at the Skout threads. Derrick reported on a couple options in his debut thread, and looks like he likes the Altaros. ManaB also reported similarly in a thread or 2. Looking like the 40gr are a winner.
I have not done much with slugs. the slugs that have had the best results with are the Altaros Kings in 5.52 These are consecutive shoots done at 100yrds using a N50 target
i get them from Tony at Talon Airguns i have not tried the Corbins