This is a picture of a 308 (same length as a 300 SAUM case) with bullets shown to the 2.950 OAL that Accurate Mag's WSM magazives will run. 2.990 is the room present, so there's .040 left on the table here. The SAUM's neck is actually .008 longer than the .308, if we're being really particular.

From left to right:
250 Berger Elite Hunter, 210 TTSX, 225 AB

Ultimately, 338 RCM already has this ground plowed. But for the sake of visualization...

[Linked Image]


Teach every child you meet the importance of forgiveness. It's our only hope of surviving their wrath once they realize just how badly we've screwed things up for them.