THE GUNThe gun has been praised.
The gun has been denounced.
The gun has played a critical role in History.
The gun has been implemented for good.
The gun has been abused for evil.
With the gun comes a great moral responsibility!
To better understand the gun is to better under stand History. And with the gun protect your future.
D.B
GONRA reminds ya'll to NOT USE TOO MUCH Aluminum pigment in primer mixes.
HUGE surface area/unit mass can thermally SQUELCH tetracene initial deflagration heat
in the usual "lead styphnate/tetracene" type primers.
Primer "Just Fizzes" for a second or so and lead styphnate never gets ignited.
Marshall,
It looks like here I have problems getting PbO2 component for EPH 10 (centerfire formula) mix. Will the mix work without PbO2? I want to reload SP primers.
GONRA primers (experiments, not mass production) are based on mixing dry ingredients
(small plastic vial in a Harbor Freight tumbler, back yard, 100 ft. extension cord)
loading dry under (typically) 3,000 PSI in brand new CCI small or large pistol primer cups
in a CH Swag-O-Matic press modified to a dead weight apparatus
using a paper “foil” salvaged from our Family Paper Punch.
Doesn’t get more scientifically sophisticated than that!
Sometimes seal with a shellac / ethanol sealant.
Then stick in a salvaged anvil, load completed dry primer into a cartridge case
and testfire in a handy pistol.
Anyway, most of the mixes over the decades have been
“pseudo initiating energetic substance” / tetracene (also called tetrazine etc.) types
with the usual oxidizers, fuels, etc. one finds in our commercial Sinoxid primers.
No liquids, no binders, no “frictionators”.
Just “high spot” tests – no laborious fancy statistics….
So, here’s random observations from all sorts of blurps and screwups over the decades:
Generally use 5% (as opposed to 3%, 4%) tetracene in all my mixes striving for reliability.
Few % aluminum pigment (tremendous surface area/unit mass)
makes a nice incandescent ball deflagration exiting the pistol barrel.
Noticed that increasing aluminum pigment concentration
eventually makes a primer that just “hisses” for a second or two, no deflagration.
This heat conduction issue/observation leads to a proposed
“two stage Sinoxid primer” ignition model:
Firing pin wacks the cup, quickly “adiabatically” (heat stays in the “compressed air”,
doesn’t conduct out through surrounding solids) compressing (like a Diesel Engine)
tiny bits of “air” in the mix.
So “air” heats up hot enough to light off any tetracene in the area.
Tetracene component of the mix “burns first” throughout the pellet
lighting off the Lead Styphnate component
then all hell breaks out with everything else participating.
Anyway, if the tetracene deflagration heat is soaked up by the
“tremendous surface area/unit mass aluminum pigment component”
one can either INCREASE the tetracene concentration
or DECREASE the aluminum pigment concentration to get a Real Live Pop.
Not a very good answer to the question, but its consistent with my
Weighty Observations Over The Decades…
Yawn.
Last edited by GONRA; 04-09-2017 at 09:54 AM.
@Gonra
What if you used larger granules of aluminum? I have been reloading 22rf with aluminum filings sifted through a 70 grit screen and they seem to still be burning when exiting the barrel of a 22 rifle. I would think that there would be a happy medium for dialing in the burn rate by the size of the granules.
GONRA sez Traffer's exactly correct.
After 9 11 never buy chemicals anymore but bet the firecracker guys have various size "powders" for sale.
Its tempting to use the Al pigment but a you suggest, best to get larger size particles.
Large enuf to have greatly reduced "surface area/unit mass" but still ignitable in your situation.
Apologies if this has already been discussed, though I've followed this thread from the beginning; but has anyone experimented with the Cheddite primer mix?
I found this on Wikipedia: "Since the 1970s, Cheddite is the commercial name for an explosive compound used as an explosive primer for shotgun cartridges. It contains 90% potassium chlorate, 7% paraffin, 3% petroleum jelly, and traces of carbon black."
Source: https://en.wikipedia.org/wiki/Cheddite
Thoughts?
The MSDS for Cheddite, also called clerinox, is mostly lead styphnate and barium nitrate. Potassium chlorate primers would be corrosive.
Thanks. So the info on WP is incorrect?
Personally, I'm ok with corrosive primers. I'll probably just stick with the FA compounds.
Tracy - GONRA believes you have somehow stumbled on a Mining Explosive.
That stuff you mention is NOT gonna "go bang" in a percussion primer. ???
Last edited by GONRA; 04-10-2017 at 06:35 PM.
@Marshall
Chemicals started arriving and I am about to start making EPH 10 center fire primer mix. After I received a can of CaSi2 (see pictures attached)I noticed that this chemical should be stored in inert gas, in contact with water releases flammable gases and should be even handled under inert gas. What is your experience using this chemical? I don't feel safe opening this can in my room. Should I get some inert gas to use it? How should I use it when making a mix? How did you use it? In some place I read that it can burst into flames by itself. Is this information correct? I would be really thankful if you or somebody else would shed more light on this topic.
valstietis
Attachment 193012Attachment 193013
!!!!valstietis!!! Yipes I don't think I would open that can without some good advice from somebody, nor would I use it in my home.
potassium chlorate . would be hard to find its like 500 al powder hasmat
It's not difficult to find. Skylighter has it.
I didn't want to start a new thread for this. I know a lot of people are still using these for primer so I am posting this. These are the best ones I have tried and this is the best deal I have seen. Legends Roll Caps
http://www.shopko.com/product/entity/94281.uts
Or a small can of Nitrogen. Just sqirt some in like you are reassembling a scope.
Wayne the Shrink
There is no 'right' that requires me to work for you or you to work for me!
Did this thread go dead for some reason, been quite for over a month.
Shaune509
BP | Bronze Point | IMR | Improved Military Rifle | PTD | Pointed |
BR | Bench Rest | M | Magnum | RN | Round Nose |
BT | Boat Tail | PL | Power-Lokt | SP | Soft Point |
C | Compressed Charge | PR | Primer | SPCL | Soft Point "Core-Lokt" |
HP | Hollow Point | PSPCL | Pointed Soft Point "Core Lokt" | C.O.L. | Cartridge Overall Length |
PSP | Pointed Soft Point | Spz | Spitzer Point | SBT | Spitzer Boat Tail |
LRN | Lead Round Nose | LWC | Lead Wad Cutter | LSWC | Lead Semi Wad Cutter |
GC | Gas Check |