Browning auto 5 choke suggestion

[Having fun now]

Recently purchased a 1979 browning auto 5 3" magnum with a 32" fixed full choke barrel. I also purchased a 28" barrel with invector plus choke. Anybody suggest a starting point for choke and shells. I have some 3" #5 long beards. Thanks for suggestions.

[SumToy]

If it is a Invector plus I would start around a 675.

[Having fun now]

Thanks