I poste this in another forum but thoguh I would post this question here too. I recently bought a Glock 23c in .40 cal. so far I have put about 150 rounds through it and I can't seem to hit anything. I have mostly been shooting from about 10-15 yards and I can't get any kind of group. I can put this gun down and pick up something else and get groups all day. I'm not sure if it is me, the ammo or the gun. do these gun have a certian break in period before they are accurate? each time I have had it out I made sure to clean it well when I was finished.

I don't know what else to do. I bought it because Glocks have a reputation of being well built and very reliable. Any help wil be appreciated.
Thanks