When I started developing the 338 Sin I was told I should just make a 330 Dakota. That would of been easier but my goal was to develop a cartridge that fit std actions with out mods and be able to have the most case capacity safely. That is why I developed the 338 Sin. It is as long as it can be to seat the bullets where they need to be and hold the most powder. I use 330 Dakota brass (made by norma) and I bump the shoulder forward, change shoulder angle, and take out some body taper. Below is a pic of a fire formed 338 Sin and next to it is a 330 Dakota before forming. The 338 Sin will drive a 250gr bullet at 3,000 fps out of a 26" barrel and a 300gr bullet out at 2800 from the same barrel and feed perfect with a coal of 3.500"

[img width=600 height=360]http://i290.photobucket.com/albums/ll272/sinarms/IMAG0165.jpg[/img]