I have a Winchester 1000X made by Daisy, a break bbl 1000fps gun, I have owned three or four years, has about 500 rnds thru it. All was well, until a few months ago I noticed it started shooting high. I have the rear sight as low as it will go, and it still shoots about 10 inches high at 25 yds. I have not changed pellets, and I have checked the gun, can't find any reason for the change. Anyone have an idea? Wallace in Ga.