FYI: The new Speer Manual, (Number 15), has some pretty extensive load data for the 257 Roberts. It's the +P data too, not the old lower pressure data.
Great thread with great info. I just prepped up 100 brass cases last night to get my wife's rifle shooting straight. It's a Ruger 77 MKii and I've had some trouble getting good groups from it. I"m determined to get it shooting however. Being here in CA I have to use non-lead, so I"ve got a box of 100 gr TTSX and another box of 90 GMX.
Last edited by Yaddio; 11/28/19. Reason: misspelled word
