OT Something else I never knew..
 

The muzzelloading Whitworth rifle had a spiraled hexagonal bore.

Here's a bad picture of an original

http://www.lrml.org/collecting/whitworth/c835.htm

John

I think this was to help with fouling as was other rifling, and the side
effect was accuracy. Is there any reasoning behind left or right hand
spiraling?

"JohnM" wrote in message
m...
The muzzelloading Whitworth rifle had a spiraled hexagonal bore.

Here's a bad picture of an original

http://www.lrml.org/collecting/whitworth/c835.htm

John