I assume you're referring to torque-free precession: https://en.wikipedia.org/wiki/Precession#Torque-free . As I understand it, that will not resist tumbling, but rather will change the particular evolution of the tumbling over time.

On Mon, Jun 29, 2015 at 4:39 PM, Anthony Jackson <ajackson@iii.com> wrote:
From: Craig Berry

> My point is that a gyro fights *torque*, and nothing is torquing a projectile in vacuum once it's left the barrel. If it emerges with a slow spin
> perpendicular to direction of flight, it will keep that slow spin. The gyro effect won't work against that at all.

Actually, it will, because of the way different sources of spin add up. Rather than tumbling, it will undergo slow precession.

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Craig Berry (http://google.com/+CraigBerry)
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