Rosebud this is the best info I've been able to find so far, but haven't found any credible reviews on its use for marijuana, yet.
PRODUCT INFORMATION
House & Garden Shooting Powder forces your plants into starting a new flowering cycle after the regular cycle has stopped, significantly increasing the fruits’ total weight. The extra yield after applying this agent will surprise even the most seasoned grower, as it actually creates a new layer on top of the existing fruit. Output increases of up to 20% can be reached this way.
APPLICATION
Use Shooting Powder at the end of the flowering period for the last three weeks.
Prepare your nutrient container by first adding your base nutrient (e.g Cocos, Hydro or Soil) to the water container. Adjust your EC of the nutrient to 1.2 and then add your Shooting Powder. Adjust the pH value to harmonise with the nutrient solution.
1 sachet to 100ltrs during the last three weeks before harvest
2 sachets to 100ltrs during the last two weeks before harvest
2 sachets to 100ltrs during the last week before harvest
Only use Shooting Powder when your plants are sufficiently healthy as it is a very strong agent that requires a lot from your plants. Always adjust the EC value of your base nutrient to 1.2. Do not use Shooting Powder in combination with any other booster.