Just because you see it on the internet doesn't make it a good idea.

[Slamfire]

Generally, it is difficult to have the technical part of a conversation about this because you receive a blank stare in return and I don’t want to talk over other’s head. .

Trust me when I say, those that don't care about technical won't read what you wrote, but those of us who do, will read your post.

Tell us until we are begging for less!

 

[Griffen]

 

[Slamfire]

When I was working on the F15 STOL project in the 80's the engineering team at Rocketdyne, White Sands, NM, flew our team and the Northrop engineering people out to conduct tests on machining stresses-strains of the Ti alloy we were using. It was very cool stuff and I understood about half of what they were doing. Bottom line: there were some catastrophic failures the materials models didn't indicate would happen. They tried changing alloys and assembly processes, then looked at the manufacturing processes. Final result was a change in the part to eliminate a pair of stressors in the angular cuts of a part that connected the thrust cone to the hydraulic push-rod. It's kind of scary to think about how just a single angled cut in an inside corner of a single part that isn't even carrying much of a load can cause the catastrophic failure of an engine and down an aircraft.

Do you watch the TV series "Air Disaster's"? I do, each program is a puzzle, and we humans love puzzles, but in the end I have learned a lot about how wiring insulation wear, cracks, etc, have all contributed to some horrific crash. There is confirmation bias all over the place for pilots. There are process errors which lead to crashes.

My best friend is a Pollyanna and won't watch a the show, because the whole basis is so negative. And he was made Chief Scientist of a program! When a Pollyanna is in charge of a program, don't be surprised when the "success orientated" hardware lacks redundancies.

 

[barnfrog]

..... a part that connected the thrust cone to the hydraulic push-rod.

Boy, if I had a nickel for every time a thrust cone came disconnected from the hydraulic push-rod....

 

[Blue68f100]

I'd like a job in destructive testing, break stuff all day and write reports on how and why it broke. Lots of fulfilling experience. To bad the ratio of report time to breaking stuff isn't higher.

That's what I did for close to 20 yrs. Some of it was fun some was extremely dangerous due to the chemicals I was using.

If I recall the fracture mechanics pre-cracking was done below 80% yield strength, published not tested. All of the material I tested was above the min requirements of the steel.

 

[ballman6711]

Years ago I worked for a guy whose father said I could break a cannonball. I know I've broken a lot of things but don't recall breaking a cannonball.

Tell us until we are begging for less!

I would also like to read more about these things. Very fascinating stuff.

chris

 

[EricBu]

If you really want to see how something will hold together...you issue it to a soldier. A soldier can break an anvil.

 

[GeoDudeFlorida]

A soldier can break an anvil.

But it takes an officer to lose the paperwork reporting the broken anvil.

 

[GeoDudeFlorida]

Boy, if I had a nickel for every time a thrust cone came disconnected from the hydraulic push-rod....

You'd have a quarter. The primary contractor (General Dynamics) caught the error very quickly. To the best of my knowledge, they only lost 5 birds and 1 aircrew, total. Not bad for an experimental update to an existing design. Now, when we were working on replacing the F16 wiring harnesses... well, let's just say the nickname "Lawn Dart" was entirely earned.

 

[dartor]

I'll say that I have a friend that reloads, and his opinion is load it at max. "Go big or go home".

"They wouldn't put it in the book if it wasn't safe".

Well, I've talked to him and tried to get him to use starting loads and work up, using arguments from being easier on the gun to using less powder. He usually doesn't listen. I usually don't shoot his reloads.

chris

I've been reloading since 1996. I've always found an accurate load without coming near maximum. Why put wear and tear on the firearm? Doesn't make sense to me.

 

[Barbaroja]

Anybody else read the comments on that video? Just a bunch of fools cheering him on and copying his work. I looked at all the comments and didn’t see a single word of caution. Look out folks

 

[GeoDudeFlorida]

According to this thread:
https://www.thehighroad.org/index.php?threads/data-requests.911164/
This guy's a Master Professor of Reloading to be worshipped.
Trust in The Internet. The Internet is always right. Digital information is the only information.

 

[RugerOldArmy]

Sometimes you have to realize that you don't know, what you don't know.

Sometimes it is hard to tell someone that thinks they know it all, that there is more to it.

After the powder guess and different components were chosen, there wasn't much of a load workup or groups on paper, was there?

 

[JFrank]

I’m still trying to figure out how anyone could double charge a case that’s 85-95% compressed to start with.

 

[Bfh_auto]

I’m still trying to figure out how anyone could double charge a case that’s 85-95% compressed to start with.

Did I miss something? I quit listening to most of the narrative early on. He's not someone I wanted to waste brain power on listening to.

 

[Mk-211]

@Thomasss
Your post reminded me about a guy that used to go shooting with us.

He was shooting some spotter tracer rounds out of his .50. Myself and another friend were watching as they went down range. We also noticed that everytime he fired one, the muzzle brake would ring!

I had to ask after he fired a few, what was the load? I said, I never heard a muzzle brake ring like that! He said he had loaded them with 230 grs of 5010!

We both took a few steps back as he fired a couple more. He then asked what they should be loaded to. We told him there's nothing published for them but most people start at 175 grns and use 190 as MAX! The M48 projo was never meant to be loaded in a full-size 50 BMG case and needs to be downloaded to be safe(r).

825 grn .50 spotter tracer on the far right, you can see how much larger it is than the 660 grn M33 ball on the far left.

 

[trekker73]

I understand something about having goals and taking risks, but one hopes there was some kind of workup not the this powder looks right, almost a grain over max let's just go for it.

Not much fun in assuming a fella did it correctly. Easier to throw him under the bus for 3-4 internet pages.

Seriously though, Id hope he didnt either, but on the subject of chasing max velocities, I got no problem with it. Ackely did it, so did Keith,Dick casull, Paco kelly, Allen, Viers etc and Roy Wby started a whole brand on it.

 

[GeoDudeFlorida]

Not much fun in assuming a fella did it correctly. Easier to throw him under the bus for 3-4 internet pages.

Seriously though, Id hope he didnt either, but on the subject of chasing max velocities, I got no problem with it. Ackely did it, so did Keith,Dick casull, Paco kelly, Allen, Viers etc and Roy Wby started a whole brand on it.

When you have to build up a head of steam to smack the extractor hard enough to eject the cases on the second try, you got something wrong.

 

[Lennyjoe]

Key is to start low and slowly work up. While I’m interested in getting the best out of my 10MM loads, I’m not willing to lose a hand, eye or bust a pistol over it.

Key is to know how to identify pressure signs and when to stop.

Thread is a good reminder though to be safe.

 

[trekker73]

When you have to build up a head of steam to smack the extractor hard enough to eject the cases on the second try, you got something wrong.

Ive had sticky extractions too, didnt stay at that level long though

 

[johnjohn]

I thought I had tight extraction issues on my grandsons Weatherby (chambered in .270 Win.) He was having trouble opening the bolt .I asked him what did you shoot at? Nothing he said, about that time the bolt opened and the case came out along with all the powder, bullet was stuck in the rifeling. All of the ammo in that batch were shorter than the max. Started seating them a little deeper after that.

 

[Jim Watson]

Or, my personal favorite, "the primers won't fall out if you add a little crazy glue".

The first I ever heard of Loctite, maybe in the 1970s, it was being used by a gunzine writer to retain primers.
I know a guy locally who still does the same to support his 1100 yard overloads.

 

[Archym]

Sorry, I'm a simple pistol reloader that likes to pop holes in paper at an indoor range. I've had continual luck loading UNDER the suggested minimum in 38spc, 45acp, and various 45 Colt loads. Why someone would like to gamble with a multi-hundred dollar gun much less their hands, their eyes, or more importantly the well being of the person in the stall next to them is just beyond me.

 

[GeoDudeFlorida]

The first I ever heard of Loctite, maybe in the 1970s, it was being used by a gunzine writer to retain primers.
I know a guy locally who still does the same to support his 1100 yard overloads.

That’s crazy!
Everbody knows you use duck tape for primers.

 

[Mk-211]

Speaking of primers, bought some of what I thought was good 50 BMG brass (TZZ).

Didn't need it at the time, put it away for a later day. Gave some to a friend who wanted to load them up. He called me and asked if I had checked the brass when I bought it? No...

He deprimed a piece and a washer fell out of the pocket! Seems that someone went nuts with a primer pocket uniformer and to make up for it, used washers to shim the primers!