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If i wasn't short staffed ATM mine would have been built already.... but I will start with a 20" barrel no can.

The way things are going with people crashing all over the show it might be 6 months...

.532 RCM (just above the rim) vs .550 SAUM (300)
.516 RCM VS .5357 at the shoulder
1.568 to shoulder RCM vs 1.5383
same OAL

Use the SAUM but push the shoulder forward and 40 deg and it would...

would you need to shorten the SAUM? extend the mag box a bit .... shorten the neck a tad blow it out parrallel with a sharper shoulder and get very close to WSM capacity in a shorter case..

or the...