Blackhorn will not fire with the Remington 209 conversion kit, the 209 primer is not fully sealed in that breech plug and causes hang fires. Badger Ridge makes a conversion for the 700ml to fire Blackhorn.
What 209 kit is your Remington now?
As others have said you need something like this to shoot bh209. Factory or the Canadian 209 conversion are no good.
https://www.arrowheadrifles.com/product/700ml-replacement-plug/
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