Thread: ADI 2217 and H1000 ?

evening ,
i have been told by the sellers of both h1000 and adi 2217 , the powders are replacements for each other . Now i have used both in my 300 win and in my 7mm prc , and can say they are "close" but not exactly a copy of one and other .
However the differnce is definetly less than a grain between loads .
So heres my question . i am almost out of H1000 , with only enough for say another 4-5 rounds of 185 bergers in the 300 win mag but i have a kilo of 2217 .
Now i know the mantra about not mixing powders , is mixing my last 350 grains of H1000 into the 15000 grains of 2217 an issue or not ? Like , their are supposed be twins ?
cheers
les