It took about 400 rounds and then i got my first jamb. I just started using Wolf ammo ( has the steel caseing). I think I'll attribute the problem to the ammo more the gun having the problem. I recently shot 150 rounds of wolf ammo with no problem. I went our yesterday and it jambed after 40 rounds. The casing got stuck inj the throat of the barrel. After removing the magazine and racking the slide agressevly a few times the caseing discharged. Now, I didnt clean my gun from the previouse 150 rounds and I think that might have something to do with it too. Cheap ammo and not enough lube? I'm not too worried unless this starts to happen with other ammo, I'll have to try some others for a conclusive test. I originally shot about 200 rounds of Walmart Winchester with no problems.