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..........................Hey there POP!!!................Looks like I`ll have another powder to try in my 300 WSM!........Any 300 WSM data yet for Rel #17?? Probably still too early!...........Just loaded up a batch of 40 rounds, 150 gr. & 180 gr. SST`s, with varying charges to test using IMR 4007 SSC. It`s burn rate falls in between IMR 4064 and 4350 and uses less powder by 10 grains or so, to get the same velocity results as the slower burners without any compressed loads...........According to the tech at IMR that I talked with and based on their tests so far, the 4007 seems to be the most accurate for the 300 WSM, while giving great velocities and using less powder in the process. That was 4007`s design purpose according to IMR..................I wonder if Rel 17 will do the same thing!!POP":23tegefa said:http://www.alliantpowder.com/products/reloder_17.htm