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greg
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Copper-plated pellets had weird effect on my Indy .22.
I was doing chrony testing of various pellets when I first acquired the gun, and if when I shot a JSB after copper-plated H&N, I saw up to 50 (!) fps drop in muzzle velocity. Took 20+ shots of lead to bring the velocity back to normal (880fps with 18gr JSBs)

Shooting cleaning pellets has the similar effect.

In general, I’ve heard seasoned people say that switching from pellet to pellet (esp from different manufacturers) can open up groups until barrel get’s ‘re-seasoned’ to the new pellet. Kinda makes sense if you think about it.