How does this happen? Choke failure.

[Chew]

So, this happened today. I'm 1000000% positive it was tight.

I was shooting plain old Winchester lead turkey loads out of an 80's Auto 5.

I was hoping to use this old gun to take a spring bird here in MO. I think that experiment is over.

[Twowithone]

Yep that choke is done.

[SumToy]

Could be a few things.  I will not say what happen to this without look at all parts. 

Now I have seen choke dropped and that can bend choke. 

Seen some barrels off center.

Some chokes that don't go all the way down.

Some chokes run a very close tolerance and push it over the edge sometimes.

Then if some barrels have had work done to them like back bore.