I am getting a custom 338 Lapua built, which will be finished later this year. So in the mean time, I am pooling reloading components. I just purchased 4k federal 215m primers(got the email 10 minutes after Midway recieved a shipment) and some Lapua brass. I've been looking at various dies and any input would be great. Also, I would like a powder that is proven accurate with this round without being too affected by temperature change. I know the magnums have a shorter barrel life and have decided to go with the SMKs. Would the 250s wear the barrel less than the 300s? The barrel will be a 1 in 10" stainless Lilja. I'm not planning to take this round out much past 1500m. Any load info and suggestions would be appreciated.