I put a 22 pound spring in mine. When I’m carrying cast bullets I put my 5.15” Lone Wolf barrel in. It has standard rifling and stabilizes the heavy 220 grain bullets better. Watch Hickok45’s YouTube video on shooting heavy cast bullets in the stock G20 barrel. They were keyholing. A real eye opener for me.

Ron

People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.
Orwell