I have all the parts for an 18" barreled 7mm deer rifle, n am debating between a SAUM, SS or 7-6.5PRC. I have the Hawkins DBM, so can load a little longer than SAAMI. Planning on shooting 140-150gr monos with a Dominus. Range won't be more than 500-600 yards. I'd love hear personal experience and thoughts, pros and cons , on any of these. Most of the information I've read are with the heavies. I use long actions and longer barrels for those.