Most male Bredli will probe 9 to 12 deep. Females normally 3 to 5. Not a whole lot is written on Bredli's which is too bad. Great animals! Several years ago Doc Rock with Southern Cross Reptiles wrote a very good article on keeping and breeding Bredli. I don't know if you can still find this article on the web or not. Good luck with your Bredli.
Respectfully,
Andy Jones