New Glock 20SF-Win 175gr ST report

Winchester 10mm 175gr Silvertip
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Taking a look inside we find a powder charge of 9.3grs.
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This is a very coarse and flattened ball powder.
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Weighing the bullet we find it weighing 176.1grs.
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At the Range, shooting at a 25 yard target, 5½” circle, same size as the ‘black’ on a standard 25 yard pistol slow fire target.
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Rounds fired from a Glock 20SF, factory 4.6” barrel and stock spring, over a Oehler model 33 chronograph. Skyscreens centered 10’ from the muzzle.
Temperature at the Range; 60-70°
RH 45%
Elevation 2700’
Clear sky