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[kingsableye]

I would absolutely intentionally tell someone to do something amusing that would end in the inevitable death of their fortress.

However, I am not doing that now. 

Magma actually does not follow the same rules of pressure in fort mode. I would definitely take steps to contain the eventual leakage, ideally into some kind of magma forge setup or awesome megaproject.

To prove my good will, here is my method for safe piercing of a volcano from the side. I recommend drilling right up the side of the tube in a 3x3 tunnel. Immediately underneath your intended breach point, build a WIDER (5x5 should suffice) chamber that is also flush up against the side of the tube. Make sure that your under-chamber is also more than 1z deep (2z should suffice).

When you breach, CHANNEL instead of mine. This instantly creates a DOWNWARD path for the magma to take instead of a FORWARD path. Your miner has a much, much higher (though not 100%) chance of fleeing alive. I have even managed to safely channel out all three blocks to make a 3x3 magma tunnel using this method.

Spoiler: Here's a diagram thing (click to show/hide)

I use the same method, made the mistake of having the lava fall pretty far without a covering on where it was going. Magma mist helped reduce the fat content of more than a few dwarfs.

[Fearless Son]

To prove my good will, here is my method for safe piercing of a volcano from the side. I recommend drilling right up the side of the tube in a 3x3 tunnel. Immediately underneath your intended breach point, build a WIDER (5x5 should suffice) chamber that is also flush up against the side of the tube. Make sure that your under-chamber is also more than 1z deep (2z should suffice).

When you breach, CHANNEL instead of mine. This instantly creates a DOWNWARD path for the magma to take instead of a FORWARD path. Your miner has a much, much higher (though not 100%) chance of fleeing alive. I have even managed to safely channel out all three blocks to make a 3x3 magma tunnel using this method.

Spoiler: Here's a diagram thing (click to show/hide)

This is a much better description of the method I was trying to relate upthread.