Just bought a Ruger Bisley in 45Colt, 7.5 inch barrel blued. I like the way the grip fits my hand vs the Vaquero grip which is a bit short for me. And I like the heavier Blackhawk frame too which allows for some pretty stout loads should I want to up the power. Took it out and tried my hand at 25 yards, and it did pretty good for my first time with a single action-I really like the sights. The trigger out of the box is pretty nice, and promises to work in with time. The only issue I had was the rear sight began walking to the left. The loads I put together were not really stout-11 grains of AA5 which was the only pistol powder I had on hand with a 255 grain LSWC. I did see the groups going left and at first thought it was just me, but when I examined the sight, the rear leaf was all the way to the left. All I had available to me was an eyeglass screwdriver, but it fit the windage screw and I cranked it in, then backed it off bringing the leaf back to center. Is this normal for Rugers to do this? Is there a fix I can employ or should I replace the rear sight?