Case accuracy longevity

[davidjoe]

I don't think it's ideal to use brass fired in a different chamber but it can work, especially if the chamber it was fired in first is any at all tighter than the latter bbl/chamber. A lot has to do with the pressure it was fired at during that first firing or so too. If mild loads, you can likely get by with it pretty well and for a long time in a bigger chamber. We have to look at brass at its largest point, which is when it's under pressure and the bbl expanded as much as the load and bbl allows or dictates. No reasonable amount of sizing will ever completely clear the "memory" from its largest state, which is where it will spend the rest of its life trying to expand to. Hence clickers in that scenario being common.

I agree, that would overwork it, now it’s more brittle, weaker or both. We see this in other metallic applications. If we over compress a spring, it will not maintain its load at the original height. If we attempt to compensate by removing and overstretching it, then it is now weaker than it originally was, even if it measures the right length preload.

Brass heads are destined to swell, spilt and crumble against the bolt like a frame by frame version of what the German hydraulic press guy and his wife do to everything they get their hands on. That it can be make to “flow” into the plunger hole tells us the magnitude of what’s going on. Its very intriguing to see simulations of metallic grain structure “fracturing” invisibly and microscopically beneath the surface.

This is off topic, but one of the things that has caused me an undue amount of mental consternation, is that a typical machining cutter obliterates the integrity of the metal in the “chip” which is fine, it’s discard, but it also does quite a number to the part’s metal. The grain structure of what got left behind, that valuable part - is also broken up, at least a good portion of the time. I must admit, videos that show this cause a person as materialistic as I unfortunately am, a great deal of anxiety over what of mine, may be like what I have seen.

 

[gunsandgunsmithing]

I agree, that would overwork it, now it’s more brittle, weaker or both. We see this in other metallic applications. If we over compress a spring, it will not maintain its load at the original height. If we attempt to compensate by removing and overstretching it, then it is now weaker than it originally was, even if it measures the right length preload.

Brass heads are destined to swell, spilt and crumble against the bolt like a frame by frame version of what the German hydraulic press guy and his wife do to everything they get their hands on. That it can be make to “flow” into the plunger hole tells us the magnitude of what’s going on. Its very intriguing to see simulations of metallic grain structure “fracturing” invisibly and microscopically beneath the surface.

This is off topic, but one of the things that has caused me an undue amount of mental consternation, is that a typical machining cutter obliterates the integrity of the metal in the “chip” which is fine, it’s discard, but it also does quite a number to the part’s metal. The grain structure of what got left behind, that valuable part - is also broken up, at least a good portion of the time. I must admit, videos that show this cause a person as materialistic as I unfortunately am, a great deal of anxiety over what of mine, may be like what I have seen.

Machining metal is not for the faint of heart with a big enough magnifying glass, huh? Lol!

 

[davidjoe]

Machining metal is not for the faint of heart with a big enough magnifying glass, huh? Lol!

This kind of worry falls into the category of first world problems, that’s certain. But I do feel better having said it, for some reason.

 

[jackieschmidt]

I agree, that would overwork it, now it’s more brittle, weaker or both. We see this in other metallic applications. If we over compress a spring, it will not maintain its load at the original height. If we attempt to compensate by removing and overstretching it, then it is now weaker than it originally was, even if it measures the right length preload.

Brass heads are destined to swell, spilt and crumble against the bolt like a frame by frame version of what the German hydraulic press guy and his wife do to everything they get their hands on. That it can be make to “flow” into the plunger hole tells us the magnitude of what’s going on. Its very intriguing to see simulations of metallic grain structure “fracturing” invisibly and microscopically beneath the surface.

This is off topic, but one of the things that has caused me an undue amount of mental consternation, is that a typical machining cutter obliterates the integrity of the metal in the “chip” which is fine, it’s discard, but it also does quite a number to the part’s metal. The grain structure of what got left behind, that valuable part - is also broken up, at least a good portion of the time. I must admit, videos that show this cause a person as materialistic as I unfortunately am, a great deal of anxiety over what of mine, may be like what I have seen.

Your last thought……….

I think this goes under the definition of “it’s a Moot Point”.

 

[davidjoe]

You are correct of course, Jackie, my stuff is what it is , truth is it works just fine whatever lies beyond what I can see!