Brent-
I continue to look and find information on the .276 Dubiel albeit sparse. This is somewhat puzzling as the cartridge was loaded commercially by Winchester for a short time. I have a few original rounds and the case measures 2.466". It is a shorted .275 - .300 H&H for discussion. I have an article referencing Griffin & Howe "improved" the cartridge in 1939. I do not have and example of the G&H Improved version but would love to measure one for grins. The two original rifles I have seen both had 1-9" twist and that is how I will barrel the two that I am putting together. The goal at the time seems to have been to put a cartridge & rifle together in a standard action that could reach out with high S.D. bullets and buck wind. Charles Askins Sr. was involved in the early development and used it quite a bit. In appearance it is a short .300 H&H. The .276 uses .284 diameter bullets while the .280 Dubiel on the full length .300 H&H uses .288 diameter. I will be using nothing lighter than 160 grain bullets and mostly 175 grain. I expect case capacity to be between the .280 Remington and the 7mm Remington Magnum. I hope to have fun with this.
