Posted on 07/30/2013 10:07:35 PM PDT by LibWhacker
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It can detonate instead of burning at a controlled rate. The ideal is having powder burn as long as it can add velocity to the bullet. If the burn peak is too early chamber pressure can go wild overcoming bullet inertia and friction. Use a good handbook, make sure the components are correct and follow directions. It takes a lot of expensive technology to do your own research and it ain’t worth it!
These are STANDARD loads in pounds per square inch.
cup just refers to the type of gauge used to measure, in most cases a crushable copper pellet of known hardness. It is placed in a hole in the chamber against the cartridge case. When the test load is fired it blows out the case wall and crushes the pellet. Measuring the amount the pellet is compressed and doing some math (actually, there are charts) gives you the pressure figure.
Even the old .38 S&W is over 14,000 psi
On low powder loads, the powder will lay out in the bottom of the casing or brass and leave an air space from front to back. When the primer is ignited, it will not burn the powder from primer end to bullet end like it should, but flash the powder all at once which results in very high pressures like Swampsniper is talking about.
To fix this, in the early days of of low powder charges, a thin layer of tissue paper or wad paper would be used to capture the powder at the primer end. You could load up some sub sonic rounds this way. PLEASE DO SOME RESEARCH BEFORE TRYING... There are powders out there now that replace having to do this.
Back in my younger days (around 13-14 yrs old)with my brother in law (before he was my brother in law) we use to reload some 06 loads for rabbit hunting that we would shoot out of his dads Garands using this method. Would not cycle, but were extremly low velocity. We could load these up for almost the cost of 22 long cartridge back in the day and were as quiet as a 22 long.
Always interesting how low the published pressures are for 8x57.
I think it’s an American industry nod to the 1888 Commision rifle issues, as European pressures are much higher and the ‘98 actions can handle the higher pressures.
Carbide dies. I’ve had lube foul the powder (yes, I used too much). I hate lube - it’s messy, many opportunities for too much or too little (scratches those beautiful nickel cases), and it’s an extra step. There’s no choice for rifle cases of course. Just MHO
Lee makes some lube that is great, it’s based on the lube they use for forming automotive panels. It dries flaky, a little bit won’t hurt powder.
I have seen no evidence of powder burns, but it was a while after it happened before I heard about it. As far as hearing damage, I think he already had some damage.
He is lucky to have not been killed.
I have always used carbide dies for straight walled pistol rounds. I hate messing with lube too. Now if I could just find 158 gr JHPs.
You are still in my prayers my FRiend.
I like you attitude.
I have been taking care of sick family member for many years. I hate hospitals.
Hope life is settling back down for you. Tell your daughter thanks for keeping us informed.
-Dave
The CTA chest to rule out PE is expensive, but in the long run probably would have saved you money, or your life. If done and it showed a clot, you would be on heparin or lovenox (sq) in the hospital and before discharge started on coumadin and continue on that for at least 6 months. Eventually your clot would have dissolved and your life saved. If no clot, no anticoagulants, which saves you the possibility of gastric bleeding, need for further testing (endoscopy, etc...), more admissions, receiving blood, etc.... I’m a RN at a major Central Florida Hospital. I have personally coded a patient (not mine) that was a post op colon resection. He got up to use the restroom and collapsed on the floor. We worked on him for close to an hour. He was in his early 50’s, married (wife in room) and had children. An autopsey was later done and cause of death was Pulmonary Embolim. That was 15 years ago. Nowdays, it is standard to start most post op surgical patients on a chemical blood thinner (heparin, lovenox, arixtra, etc...) post op day 1. We admit patients with no history at all of clots who come in with DVT’s (legs) or that have migrated to the lungs (PE). If a PE is suspected, a CTA chest or VQ scan is ordered, along with dopplers of the legs (that’s where they usually start, then break off and travel to the lungs). Treatment is usually to place on heparin sq or iv, lovenox, or arixtra (usually given for patient with heparin induced thrombocytopenia). Take the test is my advice. Your doctors can then plan your treatment accordingly. What state\hospital were you in? Phil
Long as I remember loading data for H110/W296 warned against reducing the charge weight. My pet load is 24 gr of H110 and 240 gr jacketed HP or FP. Very accurate and potent.
Glad your doing better!
The RCBS stuff works, but it's way too easy to put too much on and either foul the powder or dent the case neck with rifle cases. At least it is for me. :-(
Detonation is the result of a small amount of powder lighting off and sticking a bullet in the barrel. The main charge then goes off and produces huge pressures because it cannot move the bullet quickly enough. This is per Hodgdon which reproduced the effect in their
lab which is the best operation in the US.
I use black powder for all my short loads because it is predictable but the techniques are different than are used for smokeless those techniques cannot be used for smokeless.
I would suggest researching techniques used at www.castboolits.gunloads.com before doing anything with short loads. And ask about specific loads in your model of gun. There are lots of chemists and engineers on the board and you should read their answers very carefully as many are quite expert.
Short loads are done with fast pistol powders because they are flakes and all of the powder goes into the air when the primer goes off and the powder explodes at the same time. Use of filler such as upholstery batting is highly reccomend as it interrupts any large shock wave that may develop.
There is much bad information about this subject on the internet, especially youtube, and I would disregard it except for castboolits.
W296 is specifically placarded against short loads and I would not use it for that purpose.
I am not an expert compared to many with whom I correspond but this is simply the short version that doesn’t venture into the real technical issues which must be accounted for.
Good stuff.
"If in doubt, dump it out!"
It won’t dent cases, never had a stuck case, can’t beat that!
No you can’t beat it. Cheap and good.
Make a “dipstick”, use something like balsa wood and use sealer on it.
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