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 3 9x40 camo rifle scope 8405 BDC reticle  US $169.50
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 Nikon Omega 3 9x40 BDC matte 8401 muzzleloader scope US $153.50
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 New Nikon Omega 8401 BDC250 3 9X40 Hunting Riflescope US $226.99
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 Nikon Omega 3 9x40 BDC Matte Muzzleloader Scope 8401 US $189.95
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 NEW Nikon Omega 3 9x40 APG BDC Camo Rifle Scope 8405 US $207.95
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 Nikon Omega Rifle Scope 165 5x36 BDC Muzzleloader 8442 US $173.95
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 NEW Nikon Omega 3 9x40 BDC MATTE BLACK Rifle Scope 8401 US $204.95
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 NIKON 8401 3 9x40 OMEGA MUZZLELOADER BDC RIFLE SCOPE US $224.99
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 Nikon Omega 165 5x36mm BDC APG Camo Riflescope 8443 US $219.99
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 Nikon OMEGA 3 9x40 Silver BDC250 8402 US $269.95
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 Nikon New Omega Muzzleloader 3 9X40 Silver BDC 8459 US $228.99
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 NEW Nikon Omega Rifle Scope 165 5x36 Muzzleloader 8441 US $155.95
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 Nikon Omega Rifle Scope 165 5x36 Muzzleloader 8441 New US $174.99
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 Nikon Omega BDC 250 Rifle Scope 165 5x36 Muzzleloader US $184.99
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 NIKON 8405 3 9x40 OMEGA MUZZLELOADER BDC RIFLE SCOPE US $249.99
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 Nikon Omega 3 9x40 Rifle Scope US $.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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 8458 Nikon Omega 3 9x40 BDC300 Muzzleloading Riflescope US $184.00
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 New Nikon 8442 Omega 165 5X36 BDC Hunting Riflescope US $215.99
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 Nikon New Omega Muzzleloader 3 9X40 Matte BDC 8458 US $218.99
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 NEW NIKON OMEGA 165 5x36 RIFLE SCOPE 8442 BDC MATTE BK US $219.99
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 NEW NIKON OMEGA 165 5x36 RIFLE SCOPE 8443 BDC CAMO US $224.99
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 New Nikon Omega 8402 BDC250 3 9X40 Hunting Riflescope 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 Silver BDC 250 US $269.95
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 Nikon Omega Scope 165 5x36 BDC Muzzleloader 8443 CAMO US $195.95
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 Nikon Omega Muzzleloading 165 5X36mm Matte Nplx 8441 US $199.95
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 Nikon Omega Muzzleloading165 5X36mm Matte BDC 250 8442 US $209.95
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 Nikon Omega Muzzleloading165 5X36mm APG HD BDC250 8442 US $229.95
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 Nikon Omega Muzzleloading3 9X40mm APG HD BDC 300 8460 US $269.95
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 Nikon Omega Muzl 165 5x36 Mte BDC 250 US $209.95
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 Nikon Omega Muzzleloading 3 9X40mm Silver BDC 300 8459 US $269.95
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 Nikon Omega Muzzleloading 3 9X40mm Matte BDC 300 8458 US $259.95
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 Nikon Omega 3 9X40 Muzzleloader Scope BDC 250 8402 US $189.95
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 Nikon Omega 3 9X40 Muzzleloader Scope Nikoplex 8404 US $189.95
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 NEW NIKON OMEGA 3 9X40 BDC 300 MUZZLELOADER SCOPE 8459 US $259.99
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 Nikon Omega 3 9x40 BDC 250 Scope APG Camo 8405 US $269.95
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 NEW Nikon Omega 3 9x40 Riflescope 8405 HOT DEALER SALE US $228.95
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 Nikon Omega Muzzleloading 3 9x40 Riflescope 8404 US $219.95
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