Ithaca 99 won't cycle Low brass?

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Hi,
I have a like new Ithaca model 99 > 12 gauge auto.
The gun works fine with high Brass shells , but recently I took it to shoot some clays with a friend and it does not like to cycle the target loads>
Is there a fix for this problem???

Thanks
jrw1inpa

[jdc48160]

I've heard this about quite a few semi-auto shotguns.

My boss has 2 Browning semi-auto 12ga shotguns, and he can't shoot low brass shells in them.

The internal mechanism can't grab the low brass.

Unfortunately, the only real solution to the problem is to shoot high brass only.