Posted: 8/7/2007 8:34:41 PM EDT
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Simple. The front sight is too high (for your eyes and grip and ammo). The amount you need to file off your front sight is miniscule. Shaving off around 2 or 3 hundredths of an inch will make a 4-5" difference in the point of impact at 25 yards. So, get a really fine file, and a portable smooth flat surface. I use a plastic kitchen cutting board. Set the file on the board, turn the (unloaded!) pistol upside down, muzzle downrange, with the front sight resting on the file, and the rear sight resting on the plastic cutting board. Slide the pistol, one or two strokes at a time, and re-check groups. (A spotting scope will help.) It's easy to take metal off, but you can't put it back on. OTOH, if you get too enthusiastic, no big worry -- order a new front sight. |
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I suspect your problem results from the relatively light bullet you are using. In my experience, lightweight fast-moving bullets hit quite a bit lower than heavier, slower moving bullets. My guess is that your SIG is set for 180 grain bullets. For starters, you might try the heavier bullet just to see what happens. You can buy various SIG sight heights to adjust for such problems. Don’t know if they still sell it, but at one time CDNN offered a reasonably priced package of different SIG sights. Here’s a SIG sight chart that may help you:  |