Dober, STW, and SU35 know the scoop.
Let's make it simple.....
Buy an SPS, SS in 7mag, make sure you have a 26" spout.
Send said rifle to Karl or other top notch smitty.
Have them punch the chamber to STW, cleanup the crown, square up the action, spin it back together.
For effect, I had mine titanium cerakoted , and had Karl sprial flute the bolt....optional, but killer none the less.
Buy some IMR7828, you fav 150's or 160's.
Go shoot, be ready to get shocked at the results.
So for maybe $800 (sans optional schit), you'll have a tack driving, slaying machine.
Thank me later.....
Tony
