DIY h3 heavy buffer and questions about buffers

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So I need a few h3 buffers, maybe even heavier than 5.4 oz, and well they're a bit expensive. I was thinking would it be fine to use tungsten powder? Like buy a regular cheap carbine buffer, take off the cap(also how do you do this? A hammer and punch pin?) and replace the steel weights with this tungsten powder.

Now my question is is what's the volume difference between tungsten powder(very fine in the micron range) and solid tungsten? And do these heavy buffers use pure tungsten or do they use tungsten carbide? Because the difference between the two in density is 18.5 percent.

Now that's fine since I'd just use less powder or use the whole amount volume wise since I might need a higher weight than 5.4 oz but again it would be good to know. The brownells video on buffers said the h buffers use tungsten carbide but others say just tungsten. And another pistol buffer I have use tungsten something but it's not a silver color, the tungsten was dark and course in comparison.

So which Is it? Tungsten carbide or just elemental tungsten that's used in buffers?
Another thing, is it a problem to use powder vs solid weights in terms of the effect? What about filling the buffer completely up with powder? Is the weights bouncing around the buffer crucial to operation?