On Nov 7, 6:47 am, "Robert11" wrote:
Hello:

Was reading a book on ballistics the other day, and the author was
describing conditions
where a rifle barrel would drop a small amount as a shell was fired.

It *moves*, yes, and if that movement is downward, then it drops. When
a rifle, or any other firearm, is fired, the barrel vibrates. The
manner in which it does varies with a number of inputs -- length, heat
of combustion, thickness of barrel, bedding, etc. If its bedding or
stocking is such that it kicks in a certain direction, than it can be
drilled near the muzzle to use escaping gasses to overcome this
tendency.-

He used an example that if one held a fly rod rod truly horiz., and gave the
handle a very quick
upward (I think he means backwards; toward ones head) pure rotation, the tip
momentarily goes Downward.

Have my rods away for the season, so can't try it.

Can't visualize this happening.

Does it ?
Why does it, if so ?

It does, for reasons that Tom outlined. An outdoor writer mentioned
this in a magazine article LOOOOOOOONG ago (I think it was Trueblood in
F&S). He was fishing for short-strike bluegills, using a vintage
bamboo (read "noodle") rod. At the strike, the tip DROPPED when he
pulled up. So he had to overcome natural reflex and, as he stated it,
"...swat at them like swatting flies with the rod tip" to tighten the
line for the strike.

cheers

oz