Thompson/Center Black Mountain Magnum .50 Cal Sidelock Muzzleloader – Composite Stock, 26" Barrel, Limited 1999-2002 Production
The Black Mountain Magnum pairs Thompson/Center’s proven sidelock action with a fast 1:28" twist, magnum-rated chromoly barrel and a weather-resistant composite stock. Built in a short run from 1999 to 2002, it delivers modern ballistic capability—up to 150-grain FFg or Pyrodex charges—while preserving traditional percussion simplicity. Fiber-optic sights, the Quick-Load Accurizer false muzzle crown and a solid rubber recoil pad round out a field-ready package that appeals to shooters and collectors alike.
Condition
Overall Condition: Fair condition, showing extensive signs of prior use and handling.
Bore Condition: Good – Clean, well-maintained, minor wear marks.
Bore Rifling: Good Rifling – Intact, well-defined lands and grooves.
Specific Condition Notes: One of the barrel hangers has been repaired with JB Weld. Noticeable pitting and rust are present around the nipple area.
What’s Included
- Thompson/Center Black Mountain Magnum .50 caliber muzzleloader rifle (Composite Stock variant)
Thompson/Center engineered the Black Mountain Magnum to handle heavy conical and sabot bullets. The chromoly steel, 26" blued barrel uses a 1:28" right-hand twist that stabilizes modern projectiles while the under-rib supports a ramrod for quick follow-up loading.
The Quick-Load Accurizer (QLA) false muzzle crown eases bullet alignment, speeding field reloads without the need for a bullet starter. Fiber-optic open sights—red ramped front and fully adjustable green two-dot rear—offer bright, intuitive target acquisition in low light.
The black synthetic stock resists moisture and impact, making the rifle suitable for demanding hunts. A 13.5" length of pull and a soft rubber recoil pad help manage stout magnum charges.
As a sidelock percussion design, the rifle maintains classic lines and simple maintenance while delivering magnum performance. Its limited late-1990s production and modern-meets-traditional feature set give it collectible appeal.