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My piece of tree trunk has a circumference of 63" and is 19" high and is maple with the bark still on it. I try not to hit the same spot twice. Usually I only shoot .22s' into it.

Thanks Tuna: I'll try more rounds, I usually shoot in my basement into a 28"' dia. tree trunk , when my wife is gone. Next time I go out to the country I'll try a full mag.

I have a National Postal Meter carbine that I have fired several times When I take it apart I notice that the piston doesn't move . I have tried soaking it, hitting the housing with a rubber mallet...