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Testing was done with a Tar-hunt, 23" ported barrel. (Approximately equal to a 22" barrel). Testing conducted with a ProChrono Chronograph today in Clinton NJ, range temperature 50*. Chronograph was placed approximately 10 feet from muzzle. (Add approximately 10fps to adjust to Muzzle velocity (MV))
Winchester Partition 20g 2 3/4" Advertised Velocity....1900 MV
1851
1877
1831
1864
1834
1872
1904
1846
-----
1860
+ 10
-----
1870
1870 approximate MV average of 8 shots= Less than 2% deviation from factory advertised velocity, achieved with a 23" ported barrel.
JC
Winchester Partition 20g 2 3/4" Advertised Velocity....1900 MV
1851
1877
1831
1864
1834
1872
1904
1846
-----
1860
+ 10
-----
1870
1870 approximate MV average of 8 shots= Less than 2% deviation from factory advertised velocity, achieved with a 23" ported barrel.
JC