I'm not disagreeing with 2p or Joe about firing a full load vs. cap snapping except to point out that if you start with a full load and it doesn't fire, then what do you do? The same thing you would do if the grass doesn't move when you snap a cap: remove the nipple and clear it. The difference is you don't have a fully loaded gun to contend with.
If you want a dirty barrel to start with, snap a couple of caps, watch for dirt or grass to move, then load it up and fire away.

> Jim Legg <