Al P/M lubricant

Hello everybody

I wanted to ask about a proper lubricant for hot pressing of aluminum powder!

It is clear that I am not using lubricant cause there is no step for burning it, on the other hand I find it extremely difficult to get the powder inside a cylinderical die cause the powder takes upm very large volume.

So what should I do, get the powder inside the die with any other way or use a lubricant in a hot pressed powder?!

thank you in advance