I've got an old (15-20 yr) T/C .50 White Mt Carbine w/ 21" barrel. Used it a lot for tree stand close range shooting w/ 350 Maxi Hunter bullet and 100 gr RS. Kicked like a mule but hammered the heck out of many deer too!!! Never shot great but was OK for intended purpose. Always assumed the twist rate was 1:38. Retired it 5-6 years ago due to 209x50 Encore. Got it out of the safe recently to play with and decided to check the twist...SURPRISE...appears to be 1:24...didn't know T/C had anything w/ that fast of a twist back then. Couldn't find my old T/C catalogs but old Fox Ridge Catalog listed .50 barrels w/ either 1:38 or 1:48. Anybody out there know the deal here or have similar rifle. Thanks and GOOD SHOOTIN, Walt 