thanks for the info man. never thought about that before.To elaborate further...
Every time you pull back the slide, and drive a cartridge into the chamber, the tip of the bullet is rammed into the feed ramp, and pushed up, into the chamber.
Continually chambering the same round, day, after day, after day, MAY cause the bullet to eventually be pushed deeper into the case, reducing the case volume behind the bullet.
Same powder, less space, equals more pressure. Too much pressure in the case equals VERY bad, in unsupported chamber guns.
Keep an eye on your defense rounds if you repetedly chamber the same round, loading and unloading. Put them all on a flat desk-top and run a ruler across the tops. They should all be the same length. If one is "set back", toss it. Or pull it and reload it if you are a reloader.
This is common in 45 ACP, since the bullets are very wide, and short, and the cartridge head-spaces on the case. It will chamber fine, but create a lot of extra pop. In .40 S&W and +P+ 9mm loads, the pressure is very high anyway. With 9mm, the bullets are so "pointy", it's less common, but 40s and 45s have an issue. 40's are more dangerous, since the load pressures are very high to begin with.