Satisfied that the 45 Colt Long Load
was going to shoot about as well as anything from this gun, I set about zeroing the fixed sights for 25 yards. It was shooting a good six inches high and there are essentially no aftermarket front sights available for this revolver. So the answer was to remove metal from the top of the frame at the rear sight notch.

I just needed to determine ‘how much’. I turned to Brownells Sight Correction Calculator Brownells Sight Correction Calculator for the answer. With the PD’s 4.25” sight radius, the Math Wizard said 0.019” would get me there. I covered the topstrap with electrical tape and grabbed my freshest Nicholson 06601N and set to work- very slowly and taking measurements every third stroke. I stopped at 0.017” and eyeballed the sight notch, which was now a little shallow. I was able to deepen the notch an equal amount using a Brownell’s Pillar File, which has two safe edges and is perfect for these jobs.

When the rain stopped, I hung a target and fired five rounds standing unsupported at 25 yards. The Long Load grouped into 3” including the high shot (which I think I pulled) and 2” excluding it. Aside from a possible slight windage correction, I am satisfied. This ridiculous little 45 ACP/LC/410 combo revolver is now shooting better than the PT145 it replaced.