What Beretta do you have? I've never heard of this problem. I've only been shooting a Beretta for 25+ years. I use STOS grease on my 682 o/u but others that have been shooting longer than me just use oil. No one and I mean no one reapplies it multiple times a day unless they're wiping it off. I have one friend that never greases or oils his o/u. It keeps on working. These guys are shooting up to 300 targets in a day too.
686 Silver Pigeon. It smooths the action and reduces wear. Considering this is quite a $$$$ gun I like to keep it nice and clean.