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I just typed up an entire page on this topic and my new computer flashed, and it all went away.. sooooo, I am going to make this short I worked up a load for my buddy's 300 wsm using win brass. we were getting average fps of 3300 ish and 1/4 in groups at 200 with more than one load. we were please.... He could not find any win brass so against my advice he bought fed brass. He said " how much difference could the brass make" well, we shot the same reload recipe using the fed brass and were getting 3500 fps and major pressure issues (flat primers, sticky bolt, etc) still getting good groups, but way too fast. we reverse engineered the cartriges when we got home thinking we had used too much powder.. nope same amount of powder. what we did learn was the fed brass weighed 7 gr more than the win brass. Have any of you experienced such a difference in speed when the only difference was the brass? Please feel free to chime in.. I have always found a good load and stuck with the exact same components, so I have not dealt with this before.... Thanks, Whitey