Coll416 that's the kind of input I am looking for.

I have a 1-10" twist in my Ruger and I have no complaints at all, but I hear rumors about slower twist rates with heavy bullets. You have actual experience and that's what I want to hear, not just rumor.

If anyone else here has a 1-12" or a 1-14" twist please post your results with bullets of 300 + grains so I can speak to the folks at GM and have real facts to share with them. Also keep in mind that these blanks may be made into guns in 9.3X57, 9.3X62, 9.3X64 and 9.3X74R so I want to hear from everyone that has rifles of the 9.3 bore size, not just people shooting the 9.3X62 cartridge.