I've seen a male radix as large as any females I've seen. About the size of that 300 grammer above and approaching 100cm (didn't get an exact measurement; we had it in the clinic to remove a cancerous tumor). The gender surprised me, for seeing any garter that big is pretty impressive. I don't know if it's just because it found a nice quite place with no predators and a lot of food but it was doing something right.

Ian