As far as I know, the Nikon Omega is the first riflescope that was ever produced just for muzzleloaders and blackpowder shooters. It features a built-in BDC (bullet drop compensator) that allows you to accurately shoot a muzzleloader out to 200 - 250 yards. Prior scopes would produce an accurate effective muzzleloader range of about 100 yards. The Omega will more than double that distance accurately. As long as you utilize the specific bullet weight turret and know the range to the target, the Omega can get you there.
Here's a neat video of a hunter shooting an Omega BDC for the first time:
Here are a couple of great deals on Omega scopes:
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 Thompson Center MUZZLELOADER 3 9x40 SCOPE MOUNT KIT  US $79.99
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 NEW NIKON OMEGA 165 5x36 RIFLE SCOPE 8441 NIKOPLEX MATTE US $169.99
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 NIKON 8433 OMEGA 165 5x36 RIFLESCOPE BDC US $195.00
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 NIKON 8441 OMEGA 165 5x36 RIFLE SCOPE US $169.99
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 NIKON OMEGA SCOPE 15 5X36 BDC 250 RET CAMO FIN 8443 US $223.99
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 NIKON 8441 165 5X36MM OMEGA NIKOPLEX US $229.95
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 NIKON OMEGA 165 5X36 RIFLESCOPE MATTE BDC 250 8442 NEW US $199.99
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 Nikon Omega Matte BDC 3 9x40 mm US $84.95
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 TC Black powder muzzleloader scope rings and mounts US $9.99
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 MAUSER LARGE RING 1 3 8 TYPE LER SCOUT 275x22 SCOPE PACKAGE DUPLEX RETICLE US $109.95
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 Thompson Center ENCORE OMEGA TRIUMPH Peep Sight NEW US $38.99
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 ATN OMEGA 7X50RF LE RANGEF BINOC GRN US $200.53
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 UTG 4X32 COMPACT CQB RED GREEN SCOPE ILLUMINATED RIFLE SCOPE 45 EYE RELIEF US $94.95
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