Nipple Size Comparison
Thread Sizes:
- 1/4-28: Common in many modern American-made muzzleloaders for #11 percussion caps. This thread size is generally found on rifles like those from CVA (pre-2003 models), Lyman, and Traditions for certain models.
- M6x1 (6-1mm): A metric thread size often seen in European and some American reproductions, especially those from Italy or made for Italian designs. This is noted for compatibility with certain Investarm, CVA (post-2003), and other Italian replicas.
- M6x0.75 (6-0.75mm): Used in some Italian-made firearms, like the Lyman Great Plains Rifle & Pistol, and other similar models.
- 6x3/4: Specifically noted for Pietta black powder revolvers, indicating a unique metric thread size for specific revolver models.
Flash Hole Diameters:
- 0.028" - 0.031": Commonly recommended for modern black powder rifles using #11 percussion caps when shooting bullets, to optimize ignition without excessive blowback.
- 0.032" - 0.034": Some users have reported these sizes, with larger diameters potentially leading to hammer blowback or reduced accuracy due to excessive gas escape.
- Variable: Older or bespoke nipples might have significantly larger flash holes, historically up to 1/16" or more, due to different cap sizes or the desire for more reliable ignition in early percussion firearms.
- Standardization: There isn't a strict industry standard for nipple dimensions; manufacturers can have their own specifications, leading to variations even within the same thread size.
- Caps Compatibility: The size and design of percussion caps can vary, affecting which nipple size works best. For instance, #11 caps are standard, but the exact fit can differ slightly between manufacturers.
- Material and Design: Nipples can be made from different materials (stainless steel being common for durability) and may feature different designs like Hot Shot or Spitfire for enhanced ignition with black powder substitutes.