I heard that Browning chose Calico to treat the blanks. Calico did NOT treat blanks for themselves this way. In fact, CXalico only air dries as kiln drying ruins wood for gunstocks. It is interesting to visit Calico. They had a couple rooms the size of football fields that were so full of wood drying that it was over 30 degrees cooler inside as it formed a swamp cooler inside (which slowed the drying process) requiring that they build more building.
I have seen Browning 98 FNs that were rusted from the salt wood. I had a 1970 salt wood Superposed. The wood swells beyond the recoil pad. No rust is visible outside at first. My gun stated misfiring because the rust destroyed the springs. They will still freely replace the wood and fix damage if you have the original guarantee card. Otherwise, it is about $1000 now.