On Sat, 06 Nov 2010 19:10:56 -0400, Joseph Gwinn
wrote:

In article ,
Don Foreman wrote:

On Sat, 06 Nov 2010 12:27:11 -0400, Steve Walker
wrote:

On 11/6/2010 09:54, wrote:
http://dallas.craigslist.org/dal/bar/2044707861.html

He claims half mile range. What would the muzzle velocity have to be
to chunk a bowling ball that far?

Go he

http://www.crazybuilders.com/item.ph...roject_section


Ball diameter=8.6 inches
Ball weight=16 lbs
Cd of smooth sphere=.1




321.85 ft/sec @45 degreee launch angle

With a barrel 15" long, if peak pressure = 2* avg pressure, the peak
pressure necessary would only be about 995 PSI. By comparison, the
peak pressure in a .45ACP round is 25,000 PSI and that in a .308 rifle
is about 60,000 PSI.

One wants a large safety factor in firearms. That little tube does not
look adequate to contain a few thousand psi, at least not for many
shots.

"Looks pretty thick to me. What's the worst that could happen?"

"Oh, so THAT's what shrapnel feels like entering the body..."

--
If we attend continually and promptly to the little that
we can do, we shall ere long be surprised to find how
little remains that we cannot do. -- Samuel Butler