.50 Cal SLAP Rd Explosion Video

[Surpmil]

Interesting case. The "estimate" of 85K PSI to blow the "breech-cap" off the threads is presumably based on the manufacturer's estimate of what pressure would cause the threads to shear off as they did. Actual pressures generated here are apparently unknown.

I have to wonder if there was a more or less complete lack of case to chamber wall adhesion here. The best cause of that is oil or wax on the case or the chamber wall.

With a mere three or four turns of plain old 60° thread to keep that cap on, I for one would never put my face behind it. The threads have clearly sheared near their roots, which raises questions about the steel used and the heat treating of it.

At least an acme type thread might have been wiser, and more turns, but of course too many turns and guys get tired of it... An interrupted thread would have resolved that problem.

Were the rounds perhaps tumbled to clean them up externally? Did someone assemble surplus components with the wrong propellant?

He's a gutsy fellow anyway, and now a wiser one too.

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[jond41403]

Correct, it is my understanding that shooting slap rounds with muzzle brakes are very dangerous unless the muzzle brake is specifically designed for slap rounds

[MSW2]

I am not a fan of shooting old ammo from dubious origins. Collecting and keeping is mostly better than shooting it.

[Ovidio]

Also my opinion. I don't shoot anything I don't know the origin of.
This case was really a borderline one, but why risk one's health or damage a gun for shooting unknown stuff?
I'm happy for him, but I'm even more happy because that might teach lots of people being more cautios when handling guns.
Every accident like this is a new card in the hands of the antis.

[ssgross]

I don't shoot anything I don't know the origin of.

Absolutely...I don't shoot surplus or 2nd hand ammo, and I don't shoot another person's reloads either unless I was in the room with him when they were made.
And another thing...half his face would be gone and likely killed instantly if wasn't wearing eye protection.

[Ovidio]

Yep. That thing with good eye protection was enlightening and humbling at the same time.
I alway wear glasses, but mostly just my correction glasses. Now I'm always thinking about that video and am starting to wonder if I should always wear the safety ones.
They are so uncomfortable if you wear glasses underneath and also wear ear protection other than plugs.

[MSW2]

Yep. That thing with good eye protection was enlightening and humbling at the same time.
I alway wear glasses, but mostly just my correction glasses. Now I'm always thinking about that video and am starting to wonder if I should always wear the safety ones.
They are so uncomfortable if you wear glasses underneath and also wear ear protection other than plugs.

You can get safety glasses with your prescription lenses in made. I got my current ones issued by a place I worked for years ago. My ear protection also - two perks in an otherwise not so nice company.

[ssgross]

They are so uncomfortable if you wear glasses underneath and also wear ear protection

I use ess suppressor glasses.
https://www.esseyepro.com/en_us/ball...-hi-def-copper
They are affordable, combat tested (they had or do have a contract with US military), and the model above has thin arms to comfortably fit under comm gear...or hearing protection.
I wore them with contacts before I had Lasik a few years ago. But now, I sometimes slip reading glasses with thin arms under them too...works wonders with tiny peeps on 1903's and Krags, or tiny thin front posts on my trapdoor Springfield.

[usabaker]

They are so uncomfortable if you wear glasses underneath and also wear ear protection other than plugs.

My son complained about them hurting when he used them with this Howard Leight so I when and got him the 3M SecureFit 400.



Working at the range 9 hours a day got painful wearing safety glasses and Howard Leight earmuffs. It was a GOD send when my wife gave me these Caldwell E-Max Shadows I absolutely love them. Can wear whatever shooting glasses I want and no cheek weld issues.

[Ovidio]

I was starting to think about that myself.
Now that I just changed prescription lenses might be the right moment. I should be ok for a while...

Where in good old RSA are you, if I may ask?