With Koz, with the new ballistic programs, you can find your MV and then shoot at say 600 and from the adjustment required compute the true velocity at that range. ATRAG is one, another is Precision Workbench. I have used both, ATRAG is easier to use while Workbench is more complete.
I have not used the magnetospeed but would like to see it in action.
My 2 cents.
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Hold Hard guys
Rick B.
Knowledge is knowing a tomato is a fruit.
Wisdom is knowing it is great on a hamburger but not so great sticking one up your ass.
Author - Richard.
Experience is what you get right after you need it.
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