If you stick within the parameters recommended by a reloading manual, which you've checked against another loading manual, you really don't need a chronograph.
It's when you start creeping up to the top loads in the book, and beyond, that you really should have a good chronograph.
Is one an absolute necessity? No, not really, but it's an extremely handy piece of kit to have, and these days not expensive at all.
Me? I've always just borrowed one when I've felt the need to get above book-rated speed.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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