SAUM has more case capacity than PRC by 5-6gr (might even be more). SAUM has a rebated rim/fatter body than PRC but the same length overall.
My 6.5 SAUM is running just short of 3k with 147gr ELD-M out of 22" barrel. Mild load using 2217 rather than a double base powder. I'm sure 3k+ would be achieved with RL26 or maybe N565. Both are hard to come by down South.
I have a 22" PRC in bound and expect basically the same performance. I've got another PRC barrel being chambered for my comp rifle (heavy, long barrel) so reducing brass and dies and potential for mixing brass by using same calibre.
On Long Range Only, Broz has a 20" PRC using 156gr Berger's at just over 2.9k. That's a pretty decent step up in performance over a Creedmoor.
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