Re: 7mm RUM w/ factory tube and the 175 SMK?
Longdraw, FWIW, although my 7mmRUM is a custom job (built before RUMs were in 7mm) it likes 5010 pulldown powder the best. Retumbo was so-so, the others a distant LAST! I haven't shot the 175 Sierras, but it goes like a house on fire with Cauterucio 176 & 156 VLDs. You might try some 5010 before you rebarrel - I chrono'd this combo at 3,300+ with a 30" Krieger.