I read the book, amazing story. Too bad it only covers the first 16 or so months. In the book I remember it to be a Springfield .30-06. If you buy it off the internet the book is around $15.00, well worth the money.
Yep, I found it on page 23. Dick calls it a converted Army Springfield in .30-06. He also had a .357. Once in awhile you can see it hanging on his hip in the follow up movie on some of the older footage. Hope this helps.