6" x 9" is "trade" size, pretty much the default and very common. I was thinking just slightly larger than trade for my full book, but since I'm doing this small version I might make the full book even a bit larger. We'll see.

“The Savage 99 Pocket Reference”.
All models and variations of 1895’s, 1899’s and 99’s covered.
Also dates, checkering, engraving.. Find at www.savagelevers.com