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Cup and core were all that Kynoch had and worked for many years.

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I agree - most worked well, some didn't - much depending on the speed they were driven. Note that most were driven at barely over the 2,000fps threshold. At speeds above 2,500fps, design is MOST important.

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That is true Daryl.
I still use Kynoch 400 grainers in my 404 @ 2250 fps on pigs and paper. They shed their jackets 9 times out of 10.