Two pounds of powder probably is worth $40-50. Two pounds of powder will reload about 700 shells at 20 grains of powder each. 700 shells will require about 50 pounds of shot. At $40 per 25# bag, you will need about $80 wort of shot. Add in the cost of 700 primers and wads and now you need about $100 or more of components to make 700 shells of unknown performance. Why waste another $100?
I have heard all the reasons ,even special people relate mixing of powders.NO one KNOWS! What is your health worth? What is the health of your fellow shooters worth? Dont guess! NO MORE BULLSHIT!!! THrow it out! Jeff
No powder manufacturer will advise you to use it. The two powders, performance wise, are so different as to relative speed and will measure differently. In no way would I attempt to use such a mixture. BT100dc
Those are both double base powders with very similar burn rates. Green Dot 29 and Unique 35 on the burn chart. Both are made by Alliant. If it were me, I'd do what halfmile said. Mix it up well and use like Green Dot. I doubt you could tell any difference. No sense in tossing good powder when they are so similar.
For me, I MIGHT be able to justify using a "mixed powder" scenario if it were one shell worth mixed into a 8lb jug (>20 grains), and they were similar powders, MAYBE. Any more than that, and I'd toss it. I certainly would toss it if it were mixed 50/50, as it was in this case.
The better question is are you willing to assume the liability, and a possible lawsuit, for advising someone to use mixed powder, when you have no idea what the outcome will be? I guarantee that there is no powder company on the face of the planet that will.
Only logical and safe options for the OP are to: A. Dispose of it (if someone is so cheap they can't afford to eat 2lb of powder, then they are in the wrong sport) or B. Load some shells, and have them sent out for ballistic testing to determine the pressure. Although this would be illogical talking about 2lb of powder, since it will cost you more than the powder is worth to have the testing done.