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 BDC 3 9x40 Hunting Scope  US $129.51
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 NIKON 3X9X40 OMEGA MUZZLELOADER SCOPE NEW NO RESERVE US $132.50
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 NIKON 8401 OMEGA 3–9X40MM BDC 250 RIFLE SCOPE US $264.99
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 NEW Nikon Omega 3 9x40 BDC Reticle Rifle Scope 8401 US $224.99
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 NEW Nikon Omega 3 9x40 APG BDC Camo Rifle Scope 8405 US $229.99
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 Nikon Omega Rifle Scope 165 5X36 BCD Matte Black 8442 US $224.95
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 NIKON OMEGA MZZLDR 165 5X36 MATTE 8441 US $221.99
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 Nikon Omega 3 9x40 Muzzleloading Riflescope NEW US $275.34
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 NEW Nikon Omega 3 9x40 BDC MATTE BLACK Rifle Scope 8401 US $206.95
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 Nikon Omega Muzzleloader 3 9 X 40mm scope 8401 US $259.95
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 Nikon Omega 3 9x40 Muzzleloader Scope Matte 8404 US $99.99
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 NIKON OMEGA 3 9X40 BDC 250 REALTREE RIFLE SCOPE US $299.99
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 Nikon Omega Scope 3 9 X 40 Silver BDC 250 8402 NEW US $219.99
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 Nikon Omega 3 9x40 APG Camo Rifle Scope BDC 8405 NEW US $239.00
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 NEW NIKON OMEGA 165 5x36 RIFLE SCOPE 8442 BDC MATTE BK US $199.99
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 NIKON 8401 3 9x40 OMEGA MUZZLELOADER BDC RIFLE SCOPE US $224.99
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 NEW NIKON OMEGA 165 5x36 RIFLE SCOPE 8443 BDC CAMO US $224.99
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 NIKON 8405 3 9x40 OMEGA MUZZLELOADER BDC RIFLE SCOPE US $249.99
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 NIKON 165 5X36 OMEGA RIFLESCOPE NIKOPLEX 8441 NIB US $229.00
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 NIKON 165 5X36 OMEGA RIFLESCOPE BDC RETICLE 8442 NIB US $239.00
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 Nikon OMEGA 3 9x40 Realtree APG BDC250 8405 US $229.99
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 NIKON Omega 3 9x40 Matte BDC 250 Muzzleloader US $259.95
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 NIKON Omega 3 9x40 APG RealTree BDC 250 US $269.95
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 NIKON Omega 3 9x40 Silver BDC 250 US $269.95
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 Nikon Omega Muzzleloader 3 9 X 40mm scope 8405 US $269.95
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 Nikon Omega 3 9X40 Muzzleloader Scope BDC 250 8402 US $199.95
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 Nikon Omega 3 9X40 Muzzleloader Scope Nikoplex 8404 US $189.95
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 Nikon Omega Muzzleloading 3 9x40 Riflescope 8405 US $254.00
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 Nikon Omega Muzzleloading 3 9x40 Riflescope 8401 US $243.00
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 Nikon Omega Muzzleloading 3 9x40 Riflescope 8402 US $254.00
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 NIKON OMEGA 165 5X36 BCD CAMO US $231.25
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 NIKON OMEGA 165 5X36 BCD MATTE US $218.82
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 NIKON OMEGA 165 5X36 NIKOPLEX MATTE US $212.61
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 NIKON OMEGA 3 9X40 BDC 250 REALTREE 8405 US $209.43
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 NIKON OMEGA 3 9X40 BDC MBLK US $229.49
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 Nikon Omega 165 5X36mm Matte BDC reticle 8442 US $199.99
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 Nikon Omega 165 5X36mm Matte NikoPlex 8441 US $199.99
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 NIKON OMEGA 3 9X40 BDC MUZZLELOADING RIFLESCOPE 8402 US $196.99
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 Nikon Omega Muzzleloader 165 5 X 36mm Scope 8443 US $249.95
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 Nikon Omega Muzzleloading 3 9x40 Riflescope 8402 US $257.95
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