Grades of Stainless Steel for Rifles

[Ryan K]

I’m looking to upgrade my rifle collection. Always thought when I buy more they’ll be stainless. Now that the time is coming, I’ve been researching them and come across posts about some stainless rifles rusting easily. It seems most are made from 410, 416, or 416R stainless. Of these, it looks like 416R is the best choice. But I’m curious, are there any manufacturers who use more corrosion resistant grades? Any use the newer style super duplex type

 

[Ryan K]

Also, does anybody know what grade Tikka and Sako use? Literature just says “high grade”.