Method of loci for pi

Hi,

I m relatively new to memory training, and i have some doubt about my way of remembering pi

I have 100 images created with the major system for the numbers from 00 to 99, i take 2 of those 2 digits number and connect them with a short story, this story is implemented on a loci where the loci is either part of the story or where the story takes place

It seems pretty effective for the first 28 numbers but i wonder if on the long term this method will be efficient.

Thanks