[Chode]

i'm guess my point/wondering is, if the high speed wave from the detonator is what causes detonation and not the powder itself, meaning the farther away from the detonator the slower the wave, that's why i said maybe 1kg was a sweet spot, where more powder couldn't sustain the wave

but i don't have the ability to calculate it

[Elderberry]

The detonator initiates the detonation within the smokeless powder. The detonation of the smokeless powder once initiated propagates from the initial point of detonation throughout the entire mass.

The entire mass of smokeless powder is not dependent upon the detonator's impulse, only the smokeless powder that was in close proximity to the detonator.

As Bullseye powder contains around 40% Nitroglycerine, I would expect once the powder was detonating, that additional powder would also detonate even if separated from the initial quantity some small distance away.

Similar to ditch blasting where the impulse from one charge propagates through the ground to the next charge, separated by a couple feet of earth.