I got some WS 780 powder but have yet to reload it for my 2 Tikka T3 LS 270WSM's. I plan o try it in a buddy's new T3 270WSM. I use Retumbo for my 270WSM's but WS 780 powder is used in many of the Winchester Supreme Ammo for various calibers so I'm going to try it. I going to pull a bullet off a factory WS 243, 270WSM 300WSM and 300WM to measure the powder for something to do, and then try to match or better the results of the factory loads.