My experience parrallels that of DWalt when it comes to IMR 4227.The only help I can bring here is if you have the powder analysed so as to determine the burn rate;keep a good sample for yourself so if something turns out wrong,you'll have something to back up your sayings.
This is not said in view of sueing but one is never too carefull when somebody tries to throw sh** in your fan!
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