2.820" OAL is about the max that will fit in a M7 mag. The one I had I put a 26" tube on it. Amax's seated to mag length using a case full of N165 gave just on 3,000fps with very good accuracy. I didn't search for more velocity by trying a quicker powder as the accuracy was what I was looking for and 3k fps was good enough. If you wanted to single load, you could run a longer OAL, giving a bit more powder capacity and more velocity. N165 seems to be a very good consistant powder in the 7mmSAUM (and WSM) from what I've experienced and seen...
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