Lithgow stock finish...

[Parashooter]

Don't get hung up on finding and buying O-rings if you don't have a supply on hand. There are plenty of other ways to do the job, some of which are very low-cost like this old fishing line.


(Ed, it's still not "weedwhacker" cord.)

[bigedp51]

Don't get hung up on finding and buying O-rings if you don't have a supply on hand. There are plenty of other ways to do the job, some of which are very low-cost like this old fishing line.


(Ed, it's still not "weedwhacker" cord.)

You forget Parashooter in your first headspace 101 you told the readers to lube their cases to fire form them. I told everyone that lubing cases increased bolt thrust and should not lube their cases.
You didn't change your headspace 101 to weed wacker/fishing line until I posted this from the 1929 British Textbook of small arms.



And rubber o-rings are used for two reasons.
1. They hold the case against the boltface to prevent the case from stretching.
2. When the rubber o-ring is compressed it centers the rear of the case in the chamber. Meaning the case does not just lay in the bottom of the chamber and warp when fired.

Your thick weed wacker/fishing line does not compress and center the case like a rubber o-ring would and being harder increases lug wear. The rubber o-ring trick has been around for a very long time and works. And your weed wacker/fishing line idea died at birth and wasn't a good idea, and you just used it because I promoted the rubber o-ring method and you wanted to be different. And the problem is your idea never caught on and your the only one in the world who uses weed wacker/fishing line.

Signed
bigedp51 the non case greaser

Below is from the H.P. White Testing Laboratory and why you should never lube your cartridge cases that greatly increases bolt thrust.

"1.4 Failure of a gun assembly from internal pressure may be from either
of two (2) failure mechanisms.

1.4.1 The general perception is that those failures are the result
of a single exposure to a CATASTROPHIC PRESSURE level. This
may be an over simplification in that the strength of the
assembly may have been degraded by previous repeated exposures
to excessive, but lesser, levels of pressure whose cumulative
effect is to reduce the ultimate strength of the assembly.

1.4.2 Repeated exposure to pressures which exceed the elastic limit
of a material will continually reduce the ultimate strength of
the material until the ultimate strength is exceeded by a
relatively low pressure level causing fatigue failure."