On Mar 16, 2:15*pm, "Ed Huntress" wrote:
"John" wrote in message

...





On Mon, 15 Mar 2010 22:31:43 -0400, "Ed Huntress"
wrote:

"F. George McDuffee" wrote in message
. ..
On Mon, 15 Mar 2010 19:59:59 -0400, "Ed Huntress"
wrote:
snip
I'd start with wirecut EDM, leaving about 0.005" on
each side, and finish with a shaper and lapping.
snip
How about making everything slightly undersize and the applying
Moglice or Turcite for the final fit-up. *Should be a very slick
action and if the Moglice is only a few thousandths thick the
compression should be tolerable. *Anyone know how Moglice/Turcite
is for impact loads? *If it works on ultrahigh speed million
dollar machine tools, it should work on an small bore rifle
action.

I really doubt if they'd handle that kind of pressure, George. Their
compression strength for those loaded plastics really isn't very high. If
you figure 40,000 psi over the cartridge head, and then translate that to
the specific load imposed by the back of the block against the receiver,
it's still quite high. It probably would pound the block back over time..

We tend to think of big cartridges as being harder for an action to
handle,
but the fact is that small, high-intensity cartridges typically develop
more
pressure. Then the size of the cartridge base enters into it. But for
specific loads (psi), small, hot ones can be a problem.

.22 Hornet typically doesn't develop a lot of pressure. But a K-Hornet
can.

Didn't P.O. Ackley do some tests of forces applied to the breechblock?
I seem to remember having read something in one of his books. Seems to
me that they took a Winchester lever action, 92? 94? and tested it. If
I remember the final test was to remove the locking blocks and fire.
The bold staid close.

I have the feeling that the test might have been in support of his
"improved" wildcats with much straighter case walls but it was
interesting.

Of I have alzimers :-)

I don't remember Ackley's writings. It was too long ago for me. I do
remember the .218 Improved Bee and the .17 Ackley Hornet. They were two of
the crazy wildcats that I was nuts about when I was a kid.

--
Ed Huntress- Hide quoted text -

- Show quoted text -

I have the two-volume set, as well as a bunch of early '60s gun rags
where he was a regular writer. Most of his velocities were
"estimated" as well as pressures. Once the cheap chronos hit the
market, guys could see what they were actually getting for their
efforts and cash and a lot of the wildcats kind of faded. Then the
cheap surplus mail-order rifles faded off the scene in the late '60s
and the frenzy sort of died out. Wildcatters are still out there, but
the existing cartridges just about have all the ballistics holes
plugged for right now from mice to elephants. Benchresters are trying
to shave their one-hole group size by thousandths now, too. Most of
the improvements are in components now.

Stan