barrel diameters and muzzle brakes.

[shortgrass]

Your "data" and calculations might look good on paper, but 20+ years as a working gunsmith tell me otherwise. An antiquated design. Originally used for much lower pressured shotgun chamberings. Now, because of more modern steels used in their construction, chambered in rifle cartridges. I see at least two every year, at times as many as 5 that will not open and require disassembly to get open. Sure, headspace gauges OK, but so what if the action locks up. I've seen this more often, latley, with the more 'modern loadings' offered by the commercial ammo manufactures (Hornaday, Remington, Winchester, etc.) I wouldn't buy one as kids first gun, let alone defend how "good' they are. They'd make good tomatoe stake! Not accurate enough for long range (remember, this is Long Range Hunting) and a weak design, at that. Unsafe? Probably not. But a poor excuse for a "rifle".

 

[Clark]

Your "data" and calculations might look good on paper, but 20+ years as a working gunsmith tell me otherwise. An antiquated design. Originally used for much lower pressured shotgun chamberings. Now, because of more modern steels used in their construction, chambered in rifle cartridges. I see at least two every year, at times as many as 5 that will not open and require disassembly to get open. Sure, headspace gauges OK, but so what if the action locks up. I've seen this more often, latley, with the more 'modern loadings' offered by the commercial ammo manufactures (Hornaday, Remington, Winchester, etc.) I wouldn't buy one as kids first gun, let alone defend how "good' they are. They'd make good tomatoe stake! Not accurate enough for long range (remember, this is Long Range Hunting) and a weak design, at that. Unsafe? Probably not. But a poor excuse for a "rifle".

I have been designing things my whole life, but only charged the big bucks for over stressing my designs in missiles, cell phone towers, jet fighters, attack helicopters, and defibrillators. Go carts, mini bikes, and guns are on my own nickel.

The handgun cartridges I have overloaded in work ups just to see what happens:
25acp
32acp
32 S&W
32 S&W Long
32-20
7.62x25mm
30 Mauser
380 [9x17]
9mm [9x19]
9x23mm
257 Sig
38 S&W
38 Special
357 mag
40 S&W
10mm
10.4mm
18) 45acp

The rifle cartridges I have overloaded to see what happens:
19 Badger
223
243
6mmBR
25-20
25-35
257RAI
257RAIR
260
270
7mmRM
30-30
308
30-06
7.62x39
7.62x54R
8v57
45 Colt
45acp
20) 410

Some things I have have noticed about trying to blow up guns:
Assume all information in a load book is wrong.
Ackley and De Haas knew what they were talking about.
Nothing blows up as calculated, because of the difference between static and dynamic loads.

That is if I calculated a muzzle must be .006" thick for 20kpsi, you will never get it to blow up with a 20kpsi gunshot.

It happens too fast. Things need more time to break at the predicted threshold of yield.

 

[barnesuser28]

How i see Clark

[ame]http://m.youtube.com/watch?v=KonmpyMESp0[/ame]

 

[FEENIX]

I have been designing things my whole life, but only charged the big bucks for over stressing my designs in missiles, cell phone towers, jet fighters, attack helicopters, and defibrillators. Go carts, mini bikes, and guns are on my own nickel.

The handgun cartridges I have overloaded in work ups just to see what happens:
25acp
32acp
32 S&W
32 S&W Long
32-20
7.62x25mm
30 Mauser
380 [9x17]
9mm [9x19]
9x23mm
257 Sig
38 S&W
38 Special
357 mag
40 S&W
10mm
10.4mm
18) 45acp

The rifle cartridges I have overloaded to see what happens:
19 Badger
223
243
6mmBR
25-20
25-35
257RAI
257RAIR
260
270
7mmRM
30-30
308
30-06
7.62x39
7.62x54R
8v57
45 Colt
45acp
20) 410

Some things I have have noticed about trying to blow up guns:
Assume all information in a load book is wrong.
Ackley and De Haas knew what they were talking about.
Nothing blows up as calculated, because of the difference between static and dynamic loads.

That is if I calculated a muzzle must be .006" thick for 20kpsi, you will never get it to blow up with a 20kpsi gunshot.

It happens too fast. Things need more time to break at the predicted threshold of yield.

Murphy does not discriminate! lightbulb

 

[gohring3006]

I promise, this will be the last post on this subject from me.

It is going no where and lost it's purpose. Use the chart or don't.

I will continue using the chart and will not infringe on the minimum barrel wall thickness.
Even though I added .010 to the minimum, that's not very conservative In my opinion and does not prevent any installations that fall within the recommended thickness.

J E CUSTOM

thanks for sharing your knowledge JE it is very helpful to me as matter of fact I read every post that you put on this site even if it doesn't pertain to any of my intrest I trust you won't steer anybody into anything dangerous. Keep up the good work

thanks, Bill Gohring

 

[shortgrass]

I have been designing things my whole life, but only charged the big bucks for over stressing my designs in missiles, cell phone towers, jet fighters, attack helicopters, and defibrillators. Go carts, mini bikes, and guns are on my own nickel.

The handgun cartridges I have overloaded in work ups just to see what happens:
25acp
32acp
32 S&W
32 S&W Long
32-20
7.62x25mm
30 Mauser
380 [9x17]
9mm [9x19]
9x23mm
257 Sig
38 S&W
38 Special
357 mag
40 S&W
10mm
10.4mm
18) 45acp

The rifle cartridges I have overloaded to see what happens:
19 Badger
223
243
6mmBR
25-20
25-35
257RAI
257RAIR
260
270
7mmRM
30-30
308
30-06
7.62x39
7.62x54R
8v57
45 Colt
45acp
20) 410

Some things I have have noticed about trying to blow up guns:
Assume all information in a load book is wrong.
Ackley and De Haas knew what they were talking about.
Nothing blows up as calculated, because of the difference between static and dynamic loads.

That is if I calculated a muzzle must be .006" thick for 20kpsi, you will never get it to blow up with a 20kpsi gunshot.

It happens too fast. Things need more time to break at the predicted threshold of yield.

Does anyone else sense a TROLL in the area?

 

[Clark]

Does anyone else sense a TROLL in the area?

If you want to display bravado, I understand, but if you presence here is to sell custom gunsmithing, I would suggest to you that many high end consumers are smart enough to understand my posts.

 

[Edd]

If you want to display bravado, I understand, but if you presence here is to sell custom gunsmithing, I would suggest to you that many high end consumers are smart enough to understand my posts.

What is a high end consumer?

 

[FEENIX]

thanks for sharing your knowledge JE it is very helpful to me as matter of fact I read every post that you put on this site even if it doesn't pertain to any of my intrest I trust you won't steer anybody into anything dangerous. Keep up the good work

thanks, Bill Gohring

lightbulbDITTO!lightbulb

 

[stenger]

I just called kreiger barrels and they said min was .562 for a 30 cal barrel.

 

[J E Custom]

I just called kreiger barrels and they said min was .562 for a 30 cal barrel.

Lilja says .525 for a 30 cal, But that is the minimum muzzle diameter not the minimum wall after threading.

Lilja will not flute a barrel with less than there #4 contour (.650 at the muzzle) I recommended .648
at the muzzle in order to thread for a muzzle brake.

There #5 contour (.700 minimum for fluting) will work up to .350 Cal. (I recommended .690).

There #6 contour (.750 Minimum for fluting) will work up to .416 Cal. ( I recommended .756).

Again these are minimum barrel wall diameters!!!

J E CUSTOM

 

[stenger]

Not sure if I am following you. I currently have a. 308 barrel that is .600 muzzle dim. So .600-.308=.292. .292/2=.146 wall. 9/16 brake is .562-308=.254/2=.127. Not sure what you mean by wall dim. Kreiger said 9/16 or .562 was ok.

 

[stenger]

I read the rest of the thread. I got it the min thread dim would be .108 wall. .032 under the .140 recommended dim.

 

[stenger]

I have seen a lot of rifles use 1/2 inch brakes. Anyone ever have a confirmed problem with a. 308 cal brake with a 1/2 dim thread that the root cause was a thin wall!