Could be several different reasons. Are you using the same weight pellet. Different pellets create a slightly different sound. Also a new rifle has a break-in period, it takes about 100 to 200 shots for an air rifle to break in. The air chamber settles down over time. Or it could be just where you are standing. If you are close to a wall the sound bounces off the wall back to you. Also never dry-fire a pellet rifle this will damage the air cylinder and never leave an air rifle cocked for days on end, it will damage the spring.
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