Thank you for your response. Not only was my math incorrect but after doing several more readings at the muzzle I have an average of .476" or 12.11 mm on the lands , and an average of .506" or 12.84...
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Type: Posts; User: ydouask
Forum: Gunsmithing Tips & Tricks
Thank you for your response. Not only was my math incorrect but after doing several more readings at the muzzle I have an average of .476" or 12.11 mm on the lands , and an average of .506" or 12.84...
Forum: Gunsmithing Tips & Tricks
I have a Norwegian Rolling Block, date stamped 1877. It is not a 50-70 gov. the bore at the muzzle is 12.03 mm or 0.485 ". The groove diameter at the muzzle is 13.06 mm or 0.497 ". What caliber is...
| BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
| BR | Bench Rest | M | Magnum | RN | Round Nose |
| BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
| C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
| HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
| PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
| LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
| GC | Gas Check |