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Now I am just guessing, but would I be mistaken in thinking that a piercing piston with a wider cone angle would require more powder, but be less likely to embed if one accidentally overshoots when measuring out the powder, while a sharper cone angle would need less powder to work but be more...

Well, I'd imagine there is the downside of the mass increase, since scaling up a CO2 ejection system comes with a bigger dry mass penalty than a BP system. But of course if it's necessary then it's necessary.