You're thinking like I am, although I'll probably aim for a 26" length to get as much velocity out of it as I can. I'm still undecided on the 7SAUM vs 7SS. I don't yet reload, but would need to do so for either. I'd like the possibility to shoot heavies, and I keep hearing the SAUM struggles with the 180 class projectiles. Anyway, that's a discussion for another thread. I'll stay tuned for Josh's reply, as I could use the info myself. I'm not sure if that cert can be used on a Proof chamber job or not, but if not, my AT could use an 18-20" .308 barrel...