I counted the books on the new shelf. 100 books down the long side, and 55 more on the short side, ignoring the half a dozen hidden in the corner, so the shelf holds 155 paperback books.
Not to bad for a mishmashed set of 3 different shelf brackets that may be as old as I am and leftover wood from making the Pantry < http://mike.creuzer.com/on/kitchen-pantry >

The short leg on the shelf bracket is too long for what I want to do with it. So I needed to cut it off.

It’s not as simple as just cutting off the end with a tin snips. The ridge, which gives the bracket its strength, needs to be flattened. Here, I marked where I need to flatten the ridge to with a mild blow with my hammer.

You can see that the ridge is flattened out. The metal needs to go somewhere, so it gets all funny shaped.

This corner turned out totally different than I had planned, but I like it. I had some fancy 45 degree angle concept that would wrap the book’s spines around the corner to make it look fancy. This works too.