Your bullet is a British Snider-Enfield bullet, dating from 1866 on into the 1880s. Made for use in the .577 Snider-Enfield rifle. Many were sent from Britain to Canada for use by the Royal Canadian Mounted Police... which explains why you found yours in Nova Scotia.
https://en.wikipedia.org/wiki/Snider–Enfield
I should mention, some diggers think those bullets are from the American civil war time-period, but they are definitely from no earlier than 1866.
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Fyrffytr1, some versions of the 4-groove ("4-ring") .577 Snider Enfield bullets came with a wood plug in the bullet's nose. Others had a solid nose. Others had a red clay plug or an iron cup in the base. But these bullets are definitely not a Minie type. "Early" (late-1860s) Snider Enfield bullets came in a thick paper cartridge with a metal base and self-contained primer, and later ones had an all-metal cartridge. See photo and info at:
https://en.wikipedia.org/wiki/.577_Snider
The .577 Snider Enfield was a breechloader, so bullets would not be pulled from it... just open the breech and remove the defective cartridge. See the Wikipedia link about the .577 Snider Enfield rifle I includeded in my previous post.