The pistol is a glock 20 with 3dot sights.
I normally shoot 180gn at 1200 fps.
Today I took out some 150gn at roughly 1350 fps and it was shooting really low (1.5ft low at 5-10 yards) The only way I could hit anything was to line up the top of the rear site with the very bottom of the front site where it meets the frame.
Then, just to check, I went back to the 180's and right back on target.
Is it normal for a change in bullet weight to throw off the sites that much?
Last edited by Gohip2000; 04/17/14.
