We are selling a lot of 150 Bintac BW S45 in 357 approved 125gr slugs. We tested a lot of slugs, and this is what worked best. These are soft lead pellets sized to .356 and will also work well in the Defender 2 pistol.
The manufacturing specs for the BinTac BW S45 in 357 are 120gr or larger for proper functioning. Based on the magazine size, you can have a 120gr hollow point (Totally fills the magazine) or a solid pellet from 120gr to 127gr (a solid 127gr totally fills the magazine).