Cliff Grays Podcast with Aaron Davidson

[wind gypsy]

I think he’s referring to the standard “V angle” used for ISO spec threading. Joint meaning where barrel and action meet I’m assuming?

I know what threads and angles are i'm just trying to understand the context of 60 degree threads and barrels not staying locked up with magnums. Is there a more appropriate angle to keep them locked up? Is 60 degree standard and gw uses something different? Or are we saying they just dont stay locked up at all?

 

[Aaron Davidson]

They don't stay locked up. The axial preload you can max without yielding is less than the force generated by the cartridge expansion on firing that is opposite the thread preload.

 

[JohnJohnson]

They don't stay locked up. The axial preload you can max without yielding is less than the force generated by the cartridge expansion on firing that is opposite the thread preload.

And this is more of a magnum-specific thing or just for all cartridges?

 

[Aaron Davidson]

Larger diameter cases are the biggest culprit. All of you hotrod hand loaders are also susceptible. If 65,000 psi, and larger case diameter, it pushes on a bolt with more force as case head area increases (simplification).

 

[Lawnboi]

Why not a tapered shoulder/action mating surface. Wouldn’t that strengthen that joint quite a bit?

 

[SDHNTR]

The dude is obviously very intelligent, but it doesn't take an ungodly amount of brain cells, or a $10,000 rig, to kill a big game animal. Gone from hunting to shooting. Ol granddad with his 30-06 and 4x Redfield was a hunting machine.

This is my problem with GW. They make excellent products, no doubt, but their entire marketing pitch removes hunting from hunting.

 

[Aaron Davidson]

Why not a tapered shoulder/action mating surface. Wouldn’t that strengthen that joint quite a bit?

No. Threads already center. Might cause conflict in which feature drives....

 

[SDHNTR]

I heard him boasting other companies follow his lead on everything they produce. Do they?

I also heard him boast that his customers fly in private aircraft to come and buy his products. That’s nice. Don’t care about any of that really.

He also mentioned his customers are winners and take the biggest and best game out there. By spending how much money to achieve such accomplishments? Of course, if you have so much money you can’t spend it all in one lifetime, you can buy your way into a nice experience and trophy. I’m not opposed to rich people buying what they want. However, his marketing message there didn’t strike home with me…at all. Because that’s not the hunting I do.

Again, didn’t care for his message and condescending tone. So, I turned it off.

Why would a business owner even say that? How off putting!! I’m far more impressed by the hunter who drives his beat up 20 yr old truck to a public land trailhead, straps on a backpack and goes and kills big stuff with his bow or his uncle’s hand me down Model 70!

 

[BBob]

Here we go again..... Rokslide about 20-25 years behind the curve. A lot of this barrel action joint discussion and experimentation came about when a guy named Harold Vaughn wrote his book Rifle Accuracy Facts way back in 1998. It's available on the web in PDF for free. Find it, read the part about the barrel/action joint for some enlightenment as to what Aaron is talking about.

I'll add that back then there were tons of discussions about the whole deal on Benchrest Central and probably Accurate Shooter. Probably find a lot of that in a simple search.

 

[wind gypsy]

Here we go again..... Rokslide about 20-25 years behind the curve.

On a serious note, thanks to you and Aaron for educating us on where to read more about this.

I imagine that has a lot to do with why certain smiths want bigger actions/tennons on Lapua bolt faces.

Chapter 6 it is:

 

[BBob]

On a serious note, thanks to you and Aaron for educating us on where to read more about this.

I was just funnin ya a little bit

I imagine that has a lot to do with why certain smiths want bigger actions/tennons on Lapua bolt faces.

It has mostly to do with hoop strength with a cartridge that large in diameter. The smaller tenon/breech diameters do not leave much leeway safety wise during a pressure excursion. That said I don’t doubt that it may aid in joint stabilization.