dogcatcher seconded. I enjoy shooting at Ragu lids which aren't very big. Because once that round pops it and you see the dents I keep going. I know I'm not the only one who goes "after this shot I'm done for the day....... Well maybe 5 more hits and I'm really done." You just feel better with immediate gratification.You are getting better sensory feedback from the "THWAK" when the projectile bangs into the metal can. It automatically helps your aim adjust for the next shot.
That's my theory anyway.
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