Cleanest 338LM powder?

[Shooter ----/]

Hello all,
I am wanting to know from those with experience what is the cleanest burning powder to use in a 338LM pushing 300SMK's?

I am currently using H1000 with much dissatisfaction. Carbon fouling is horrendous! My chamber has a short throat so seat depth is very deep thus not allowing a large powder charge. I have, however, found that my primers are flattening slightly with 87gr. of H1000 so I believe I am limited there.

Any help would be great! In the mean time, I am going to try and locate some Retumbo to try.

Thanks.

 

[Kevan]

I realize this may not be of much help to you because I'm using it in a 338 Lapua Improved as opposed to the standard Lapua, but by far and away the cleanest and best performing powder for me is Hodgdon US869.