Any of you guys tried Shawns new 338 Edge brass for any other projects. I have it in my head, for some dang reason, to build a 7mm Ultra on the new brass. I would love to build a 7mm Allen mag, but don't have anything with that bolt face. My guess is that with the good brass this 7mm would nearly mirror Kirbys big 7. I already have a couple of 7mm Rem mags, 300 wby, and a 338 Edge. I just have an urge to do a super 7....just add another BBL to my A-5 platform Is the standard 7mm REM Ultra Mag based on the 300 RUM or the 338 RUM case?