Gotta love that sound....

[zanemoseley]

I use paper targets, usually many many layers stapled on top of each other on a cardboard backer, pellets hit a solid lead disc in the trap. If I'm really in the zone and start stacking shots the sound changes as the pellet doesn't even touch paper and gives me a satisfying sound of lead on lead contact, instant gratification.

[kevinweiho]

I use a cone pellet trap and when the pellet hits the center area, it has a distinct "ping" sound rather than the annoying sound when it hits the sides of the trap. It does give you instant gratification like you said.

[john bickar]

There is an outdoor range that I shoot on quite a bit that has steel targets at 100 yards on some of the firing points. On one particular firing point, shooting an X at 50 yards with the .45 will get you a "ting!". On a different firing point, shooting an 8 at 7 o'clock gets you the same audible response.

Choose your firing point wisely :)