Teslong borescope -- What It Reveals Can Bug You

[ELR LVR]

What a mess of stuff to straighten out and apparently, explain. Im not doing it tonight but you're headed in a different direction for some reason. Is that intentional?

the only direction I was in
was bore surface finish, in relation to coppering/fouling
and how/why guys overpolish their bore and the detriment of it
thats it
every other thing you are posting such as Hoop Stress is irrelevant to this
---
I believe I addressed everything I am trying to say here in post #58
and started on this one and only point in Post #34
I do not understand how this one point was misunderstood and got de-railed into other categories
However I didn't mean to upset you in any way

 

[Tangent]

I'll just add, I try to do the minimum that gets the job done, i.e. maintains accuracy. Mostly as it saves me time and resources, but secondly any interaction you have has the potential to change the status quo, for the good or the worse.

I suspect a lot of choices are a function of personality. So long as it doesn't degrade accuracy I'm sure there are many correct answers to the same question.

 

[DaWhit]

Gives you some idea how much a bullet can expand under pressure when not supported.
I can’t verify, the author has passed, but this bullet was recovered from a deer. I believe this was a .35 cal bullet encased in a homemade sabot and shot out of a .458 cal smokeless muzzleloader. The bullet was swelling into the groove cut into the sabot, which was designed to help the bullet shed the sabot.
I personally have recovered bullets sized to approximately.450 and shot out of .458 bores for a sabotless smokeless muzzleloader discipline. The recovered bullets slip into the barrel with little friction when loaded but when recovered have the grooves cut into the bullet. That is with loads estimated down around 40kpsi. And the bullets are not getting drove into the lands like a conventional cf bore so the pressure rise is slower to peak.

 

[gunsandgunsmithing]

the only direction I was in
was bore surface finish, in relation to coppering/fouling
and how/why guys overpolish their bore and the detriment of it
thats it
every other thing you are posting such as Hoop Stress is irrelevant to this
---
I believe I addressed everything I am trying to say here in post #58
and started on this one and only point in Post #34
I do not understand how this one point was misunderstood and got de-railed into other categories
However I didn't mean to upset you in any way

You didn't upset me and we agree about surface finish, which is on topic for this thread, but a bullet on a string wasn't. Carry on.

 

[JFrank]

The expanding barrel thing sent me to the curb picturing a snake swallowing an egg.

 

[William Vogel]

The pressure curve that’s given in both GRT and Quickload shows that usually the peak pressure is several inches down the barrel in rifle ammunition. I believe that the base of the bullet as it’s engraved by the bore and grooves of the barrel forms a very small “lip seal” similar to all types of lip seals such as in hydraulic equipment etc. The more pressure that is exerted will force the lip against the bore and it can reach a point of failure but that’s generally only after way too much pressure is applied. I’ve recovered bullets from time to time and the boat tail is intact, the bearing surface has a slight lip formed where the engraving occurred. I found no reason to measure anything because the bullet gets deformed when it strikes the target. Barrel harmonics are created during this pressure rise/expansion stress episode.