I contacted Hodgdon and they have no published loads for 338 win mag using Retumbo. There are loads for 7 mm Rem mag , 300 win mag and lots of larger calibers. I read about people using it in 25-06 and hope someone here has had some experience with Retumbo or read about a starting load for 225 gr,338 win mag.My quest continues , thanks.

I read through reloading data on different calibers and charge weights ( what a nerd, sad) and noticed the efficientcy of certain powders. The load I use for my 338 win mag is the highest one published and I worry about throat erosion and have had issues getting the type of gun powder I use . I was hoping to find a powder that will give me options when I can't find the one I use. None come close to the velocity of Alliant RL 19 and it is super accurate. As you can see I have too much time on my hands and this takes the place of watching tv at night.Sad I know, LOL..