I need some loading data for 338 lapua with 300 gr bullets and WC 867 powder. A friend of mine gave me 8 lbs of unopened WC 867 powder . I just need a starting point. The only loading data i have found is a 105 gr load on snipershide. I have a pvm-21 chronograph and can work up aload but was hoping someone here has used this powder in 338 lapua and could give me some tips.