In HS I bought a mechanical pencil with .9mm lead. I could bubble in the circles with just over one rotation, and the rectangles with a single swipe. It was the best.
Was it a Sumogrip, by chance? I had one of those too and it was awesome. I used it for everything and eventually lost it in undergrad.
Nope, but it did have a huge jelly grip like that. It was a super heavy metal pencil, which gave it a feeling of gravitas.