Surprisingly enough there is no need for filler. I questioned it as well but it works great just the way it is. I was using 70gr of 4895 and a 300gr Hornaday and it was a tad brutal after a half dozen shots.
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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