Dave, I too have a 338 RUM sendero. I read a post you made reguarking the 300 SMK. You state that RL 25 is better. I'd expect this with the weight of the bullet. How much better is it (velociy). I've only used RL 22 (actually I just finished breaking it it) because I've been unable to find data with RL 25. I got a lot of data from accurate reloading (at your suggestion) but am still seeking more. Please post data, anyone else?