Took a while but finally have all the components to reload my 338 Lapua Mag. I had been using Hornady 250grn BTHP and have been unable to obtain. Went to Cabela's Saturday and scored 100 rounds of Hornady 285 grn BTHP. For powder I like IMR 7828 and scored 2 lbs of the IRM7828scc. Have new brass, Hornady, and primers, CCI Magnums. What I'm missing is load data and C.O.L. My 7th edition of the Hornady reloading data book only goes to 250 grns. I hate guessing at loads, especially using different components. I've researched IMR reloading guide and others but unable to find this exact component mix. Can anyone help? Also, when I study data for larger grain bullets the weight of the powder goes down, in my example, about 2.7 grains per 25 grains of bullet weight. Can anyone help me with that. Either or would be great. Heading to the mountains in 2 weeks and will site in at 200yds then can go out to 500yds.
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