displaying custom post types by taxonomy in columns

I am working on a self-hosted site, so I can’t link.
I have a custom post type I made called “producers” and a series of taxonomies that describe the content of that post.
You can see how I set this up in this forum here – towards the end:

Both the custom post type: “producers” and some of the taxonomies that I will enter (eg. under “country” if it is “France”) will result in very long lists between 45 and 100 posts. That is too long.

I have already called for just the post title to display in indexes of the post type and all associated taxonomies. I also want to make three columns out of these results. How do I do this? I tried jquery masonry but it didn’t work. I tried Alchemyth’s techniques but that did not work either. Thanks.