I took my Tomorrow's Answer rocket into GM's this week. Since it has Field Prep(great perk btw) I only put on 1 rocket launcher reserves on my chest thinking I would get 10 rockets. Later on during the strike, found out I was capped at 9. From my experience double reserves gives you 10 rockets on both Eyes of Tomorrow and Code Duello. Field Prep isnt increasing the reserves, I'm not sure if its just tied to Tomorrow's Answer or its all rocket launchers or all weapons for that matter. Side note, last season only 1 reserve mod worked, and if you had Field Prep, it counted as that 1. So there might something funky there. Love ya Bungie, thank you for working so hard on Destiny. You guys are over worked and under paid lol