Loading .45 (acp, Colt, or most other flavors) with TiteGroup is the same way. Seems like a proper charge is just a dusting in the bottom of the case.
The big problem with the fast, dense powders in large cases is that it is much harder to see a double charge. You don't need a filler but you do have to be careful. It's probably been close to twenty years since I used 700X. Does it still measure about like you'd expect cornflakes to?
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