Grendel II chamber

[nincomp]

Here is a link to the SAAMI site. After a couple of menus, you get here:
http://saami.org/specifications_and_info.../index.cfm

The site has an annoying quirk. When you get the rifle, pistol and revolver, or other PDF sheet, the hotlinks to the individual drawings do not work in Firefox. They work just fine in Internet Explorer, though.

You will see all sorts of leade and throat geometries. Most of the ones from the past 20 years or so resemble that on the Gren II. A section of straight leade followed by a tapered throat (commonly of 1.5 degrees).