Re: should i rebarrel my SPS to shoot heavy bullets???
I'd try running an 87gr Vmax from that factory tube. They'll get ya to 800yds on the cheap...
Then when you've become bored at 800, and/or or shot the barrel out, get you a fast, 1:7.5" tube & good stock. (you could be saving for these along the way). Have the work done by a reputable 'smith...
When your new hammer is returned in all it's glory, commence rockin' 115DTACS with your 1K capable .243...