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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 NIKON OMEGA SCOPE 15 5X36 BDC 250 RETICLE MT FIN 8442  US $211.99
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 NIKON OMEGA SCOPE 15 5X36 BDC 250 RET CAMO FIN 8443 US $223.99
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 UTG 4 16X40MM AO MIL DOT RGB FULL SIZE ZERO LOCKING NEW US $109.95
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 NIKON OMEGA MUZZLELOADER RIFLE SCOPE US $102.50
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 Leupold VX II 3 9x40 Rifle Scope Vari x ii 2 3x9 Matte No Reserve US $142.50
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 Nikon Omega 3 9x40 Matte BDC 250 Rifle Scope black powder US $99.00
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 Thompson Center MUZZLELOADER 3 9x40 SCOPE MOUNT KIT US $79.99
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 Nikon Omega Muzzleloading 165 5X36mm Matte Nplx 8441 US $189.99
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 Thompson Center ENCORE OMEGA TRIUMPH Peep Sight NEW US $38.99
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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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 ATN OMEGA 7X50RF LE RANGEF BINOC GRN US $200.53
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 NIkon Omega 165 5 BDC250 Scope APG camo 8443 US $209.00
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 NIkon Omega 165 5x36 Matte Nikoplex 8441 US $179.00
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