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#2979144 - 07/23/16 12:03 PM Re: Understanding Pressure [Re: orkan]
204 AR Online
PM senior

Registered: 01/31/10
Posts: 6067
Loc: Nebraska
Ditto what ackleyman said!
photobucket sucks

#2979492 - 07/24/16 09:29 PM Re: Understanding Pressure [Re: orkan]
Bowhunt Offline
Die Hard Member

Registered: 11/28/15
Posts: 801
Loc: Illinois
Fantastic article! Great job and thanks so much for posting.
If the women don't find you handsome.....they should at least find you handy!

#2984130 - 08/10/16 03:44 PM Re: Understanding Pressure [Re: orkan]
jpx2rk Offline
Seasoned Member

Registered: 01/24/16
Posts: 162
Loc: Tennessee
Good read. At what level of magnification were the pictures taken? Can you see most or all of the danger signs with a 4x magnifying glass, or is stronger magnification needed??

#2984810 - 08/12/16 08:25 PM Re: Understanding Pressure [Re: orkan]
orkan Offline
Die Hard Member II

Registered: 06/27/03
Posts: 1745
Loc: Western SD
The pics were taken with a special "macro" lens on my DSLR. Here is the lens:

You can usually see pressure signs with the naked eye. The images were high resolution so that the effects could be easily seen by anyone reading. Any magnification will help however. The illuminated loupe I mention in the article will work quite well. Here it is:

#2989389 - 08/29/16 05:16 PM Re: Understanding Pressure [Re: orkan]
Mark204 Offline
Seasoned Member

Registered: 03/12/16
Posts: 352
Loc: Midwest
Wow...written in a way that "average folks" can understand. The pics were essential in getting a grasp on what you were trying to convey. Thank you!!

#2998219 - 10/07/16 09:48 AM Re: Understanding Pressure [Re: orkan]
Jason B Offline
Predator Master

Registered: 08/01/16
Posts: 81
Loc: Corn Country, Central IN
Great Article.

I will echo what Mark204 said in that it was written for the "average folk". The pictures made it very easy to follow and understand.

Thanks orkan!!

#2998595 - 10/08/16 09:24 PM Re: Understanding Pressure [Re: orkan]
why Offline
Die Hard Member

Registered: 08/29/14
Posts: 811
Loc: md eastern shore
I didn't read this untill today. Very informative, I learned a few things. Thank you.

#2999488 - 10/12/16 01:26 PM Re: Understanding Pressure [Re: orkan]
SteWil234 Offline
New Member

Registered: 10/02/14
Posts: 13
Loc: Utah
Thank You, some very helpful information.

#3001504 - 10/21/16 08:57 PM Re: Understanding Pressure [Re: orkan]
whispig Offline
Predator Master

Registered: 01/10/11
Posts: 64
Loc: virginia
Great read. Just goes to show how much I don't know... VERY much appreciated.

#3006493 - 11/08/16 09:59 PM Re: Understanding Pressure [Re: orkan]
Nitroman Offline
Seasoned Member

Registered: 01/28/12
Posts: 283
Loc: Southwest Alaska
Temperature increases the RATE of a chemical reaction, which is why loads that work on a 40* day will extrude brass on a 110* day in the sun, not the AMOUNT of energy.

Looking at that Mauser bolt that had the lugs sheared off; unfortunately people aren't very smart these days, lots of stupid going around, and they do not read the loading manuals and load to velocity, they load to what is in the book and wonder why things go wrong.

The only way to truly know what is going on inside your rifle is to use pressure testing equipment such as Pressure Trace and a good chronograph like the Oehler 35p.

Good article.
Piddle with the puppies, or run with the wolves...

Better living through chemistry!

#3006682 - 11/09/16 09:01 AM Re: Understanding Pressure [Re: orkan]
NV Bill Offline
Seasoned Member

Registered: 11/06/13
Posts: 183
Loc: Columbus, MT
Well done article, thank you for taking the time to put all that info together with photos.

#3008362 - 11/14/16 10:14 PM Re: Understanding Pressure [Re: NV Bill]
Wyodogger Offline
Predator Master

Registered: 09/21/16
Posts: 66
Loc: WY
Very helpful article!

BTW the blown-up rifle belonged to Chris Comer (RIP), a shooting buddy, a vet whose father died in WWII on Peleliu, and one of the nicest men you'd ever want to know.

Fulton armory said the barrel was made of a bad batch of steel that was held at too high a temp too long. Consequently, the steel molecules were too big, which eventually caused the blow-up. It was not a high pressure load. That was also shown by looking at the primer of the round in the chamber when it blew up; no pressure signs.

To add insult to Chris's injury, he couldn't replace the rifle as it was grandfathered under one of Kalifornia's goofy AW laws. I'm so glad I left that socialist, leftist hellhole.

#3010335 - 11/21/16 08:02 PM Re: Understanding Pressure [Re: orkan]
sakalmon Offline
New Member

Registered: 11/03/16
Posts: 21
Loc: colorado
Awesome! I will reread several times until it all sinks in.

#3026236 - 01/01/17 02:11 PM Re: Understanding Pressure [Re: sakalmon]
prairiefire Offline
Die Hard Member

Registered: 08/27/12
Posts: 760
Loc: Nebraska
For a relative reloading newly (only been at it for three years) this was an eye opening article. Made me take a step back and realize how complex accurate reloading can be and how one must never become complacent. Thanks!!

#3033614 - 01/17/17 05:12 AM Re: Understanding Pressure [Re: orkan]
Strudy68 Offline
Junior Member

Registered: 01/09/17
Posts: 45
Loc: SE Iowa
Very good read!!! nice to see to step by step surprised that more pressure didn't have the effect that one would think....

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