On Thu, 18 Sep 2014 15:56:50 -0700, "Bob La Londe"
wrote:

"Richard" wrote in message
...
On 9/18/2014 4:41 PM, Ed Huntress wrote:
On Thu, 18 Sep 2014 15:50:49 -0500,
wrote:

On 9/18/2014 2:38 PM, Ed Huntress wrote:

"Barking" squirrels is an old legend. It can be done -- with a
high-powered rifle, but not with a .22 or an air gun.

Most air gunners go for head shots on tree rats.

Sure. Those of us who hunt them with .22s like to do that, too.

I'm not going to Pennsylvania just to shoot squirrels with a rifle,
though.


I've taken two - and justify them as home-invasion defense.
Walmart .17 caliber Daisy pump-action.

AS an aside, when I first got my chronograph I couldn't wait
until I could arrange it with the range, so I went out back
and set up a back stop on the barn.

From four strokes up to eight, each stroke added 100 fps to a BB.
Yep, right at 800 FPS at eight strokes.
That was unexpected!

Wow. I'll say.


I couldn't find the original data.
I guess I tossed it once the real work started.

Waiting for my bride to get home, I grabbed the chrono and set up to try
it again.

Ol' Daisy is a couple of years old now, and has been shot quite a bit.

Best I could get today was 622 fps.
And the linearity of strokes to velocity wasn't there any more.
Starting at five strokes gave 522, 536, 596, and 622.

But the 800 fps number was for real - brand new...

Not saying it didn't happen. It would have been exceptional though. The
fastest multi pump Daisy I could find listed at Pyramid Air is rated at 750
with BBs. I never felt mine shot as fast as they claim, but if you had a
little oil in the chamber you might have gotten some dieseling. Usually
though if you get dieseling they fly out much faster than 800 and target
poorly as they fly through the turbulence around the speed of sound.

There was a time that I knew the history of air guns (I had a book on
the history of them that I got from the Outdoor Life Book Club, but it
was loaned out once and it's gone). One thing I remember is that
high-pressure, high-velocity air guns are very vulnerable to dieseling
on the lubricating oil. Spring-types are particularly vulnerable, but
other types will do it as well.

A little lubricating oil, dieseling in the gun, can double velocity.

--
Ed Huntress