A .700 Hubel Express Cartridges, one of multiple variations of a big-bore hunting cartridge.
<a href="https://en.wikipedia.org/wiki/User:Hubel458" class="extiw" title="en:User:Hubel458">Ed Hubel</a>
<span class="int-own-work" lang="en">Own work</span> (<span lang="en" dir="ltr">Original text: <i><bdi lang="">I, <a href="https://en.wikipedia.org/wiki/User:Hubel458" class="extiw" title="en:User:Hubel458">Ed Hubel</a>, took this photo myself. Can also be found on my website <a rel="nofollow" class="external autonumber" href="http://www.gunownerstv.com/700phfeed.jpg">[1]</a> I own picture and site.</bdi></i></span>)