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I do believe that the 12 pounder whitworth had a screw on breech cap and fired its projectile from hexagonal tin or zinc plated charge cases which extremely rare.
Another British design, the Armstrong rifled field gun saw action as well as the Whitworth but had a convential rifled bore and had a transverse breechblock locked in place by a threaded breech plug.
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Well Sir, once again, you HAVE impressed me!!!!! [img]/ubbthreads/images/graemlins/laugh.gif[/img] I knew that as well, however the breach seal in the Whitworths often stuck rendering them as muzzle loading cannon. Did you happen to know that the Confederates also had rounds that were to be fired out of the common 12lber Napoleon smooth bore (4.62" bore) that had spring loaded wings
that upon exiting the barrel, imparted a spin on the projectile. [img]/ubbthreads/images/graemlins/grin.gif[/img] Technology back then was UP AND COMING!!!
Tell you a SHORT story, then I'll shut up again. Interestingly, I have been "studying" CW Artillery for no less than 6 years, travelling to visit battlefields, photographically documenting different cannon, when at my step grandfather's funeral I met his youngest brother. His brother is in SCV, and he was told of my interest in the War of Northern Agression by other family members. After our introduction, we began talking about the War, I told him of my interest in CW Artillery. He told me of a Confederate artillery unit that started near where my other grandmother lived.......to make a long story short, 11 out of 13 of my Confederate veterans on my mom's side were in Maury Artillery.
So to condense, CW Artillery IS in my blood, even before I knew it was!!! [img]/ubbthreads/images/graemlins/shocked.gif[/img]
I am also a study of the Safaris of the early days, too, believe it or not. I have several Safari books in my library as well, and LOVE reading about Fredrick Courtney Selous hunting elephant with his muzzle loading 4 guage and that "cannon" knocking him off his feet when firing at a charging bull. John Taylor is another of my favorites. I also own TWO .416 Rigbys! [img]/ubbthreads/images/graemlins/cool.gif[/img]