I have a Rem700 with a Shilen barrel and recently had a Bat SV action built with a awesome piece of english walnut and a Shilen barrel. Both guns shot great right out of the gate with no load developement. Im using 32gr Nosler BT with 18.0grs of 4198. I have never had such an easy caliber to load. I won't even take anything varmint hunting I love the 20 so much.