How light (in grains) could a 12 gauge sabot slug possibly get?

[bwh]

This is the lightest 12 gauge sabot slug that I could find: http://www.midwayusa.com/product/86...gauge-2-3-4-300-grain-sst-sabot-slug-box-of-5

I simply am curious about this.

 

[243winxb]

300 gr is about the the lightest i have seen. http://www.ballisticproducts.com/