Can someone point me at any differences between a 6-06 AI and a .243 Catbird. With some basic "Gugle Fu", it would seem the 6-06AI has a 40 degree shoulder and the Catbird is designed with a 35 degree shoulder. Both improved, just with a different shoulder angle? Both made with either 30-06 brass but easier to do with .270 brass...which I have lots of. The reason for this project is that I've already bought a SS Shilen Select Match 1:8 ratchet barrel but I didn't realize until I started pulling my M70 apart...that I actually have a .243 Win, built on a Long Action. Since it's just going to be a light use, strictly hunting rifle...I figured...why not utilize the long action and roast that pipe. Would anyone have a line on a DBM for the long action M70, and to go with it...a Double Stack, Single Feed mag that would handle 30-06 style rounds.