Harvey has a number of GaugeMate adapters. A 40 plus year reloader, he even makes his own shot in 200 pound lots. He tested our 10 to 20-g “Gold” adapters using an PACT chronograph with Winchester AA and Remington STS ammo.
First he ran the ammo through a 20-g gun. Both brands have a nominal Velocity of 1200 fps. The AAs produced 1222 fps while the STS gave 1211 fps.
Next he tested two 10-g 3 ½’ guns. One was an Italian o/u while the other was a Spanish side-by-side. Both had 30” barrels with full chokes. Both guns had importer marks but no brand names. Patterning was done at 30-yards with a 30-inch circle.
In the Italian o/u the AAs produced 1287 fps and 99% patterns. The STS ammo was slower at 1082 fps but also gave a 99% pattern. In the Spanish side-by-side, the AAs clocked at 1186 fps and produced a 92% pattern. The STS was slightly faster at 1196 fps with a 94% pattern.
See GaugeMate's sub-gauge adapters in action in our Gaugemate Challenge Video
Learn more: "How Sub-Gauge Adapters Work
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