I had the opportunity to test the 158g LSWCHP +P when ATK Corporation representatives were at our main firearm training facility. I fired 5 rounds into ballistic gelatin using my Model 60. None of the projectiles expanded. All 5 rounds of Speer 135g GDHP +P expanded. Federal Hydra Shok 147g +P did not expand, but the projectiles looked like the projectiles used in 9mm Hydra Shok.
I just looked at the projectile for the new 130g Hydra Shok on Federal's website and it looks considerably different than the older version projectile. When I see it on the shelves locally, I am going to pick up some and try it out.
You probably already know this, but be careful to protect your eyes when practicing contact shooting with a magna-ported handgun. I've experienced upward muzzle blast when shooting a 4" revolver with the same feature.
Where are you finding the Speer 135g GDHP +P ammunition? I cannot find any locally or online.