Thread: powder for magnums?

im loading for my 7mm rem mag, im using AR2225 and im finding its leaving a lot of sooty shit in the barrel after each shot. i have also used this powder for my 270wsm and it had the same sooty shit left behind. are there any cleaner burning powders i could use for my magnum so i dont need to clean after every shot? or is there another way of getting a cleaner burn from the 2225? iv only ever used ADI powders.

thanks.