Has anyone found a place that has 16 gauge shells in stock? I'm looking for something in either 7.5 or 8 shot so I can take my Valmet O/U out to the local trap range.

I picked up a few boxes locally

RST has had 2 1/2" shells made for the Browning auto 5 in stock......there's no reason you couldn't shoot them in a modern O/U. RST makes excellent shells.