- #1
Edsel
- 4
- 5
I’m not really sure where to ask this, but here goes:
I am trying to find a topic to read on which explains the behavior of brass during reloading (an activity that’s part of recreational shooting).
Shooters who handload recycle brass by refilling brass cases with new primers, smokeless powder, and bullets. But said brass cases need to be sized down to fit with sizing dies prior.
Let’s say that brass case fired from Person A’s hunting rifle gets ballooned by +0.002” longer than the chamber. The sizing die, set to a fixed volume suiting the tight chamber of Person A’s rifle, compresses the brass case down to -0.001” shorter than the chamber.
Now, brass fired from Person B’s loose chambered hunting rifle gets ballooned by +0.006” longer than the chamber of Person A’s rifle. Using Person A’s sizing die set to the same prior fixed volume suited to his rifle’s tight chamber, one can only compress Person B’s brass case down to +0.002” longer than the tighter chamber of Person A’s rifle. This is achieved after multiple compressions, gradually going from +0.004”, then +0.003”, and finally +0.002”… But there appears to be an asymptotic limit of sorts at +0.002”, never truly achieving -0.001”. Person B’s brass cases cannot be sized to fit Person A’s rife, unless Person A reduces the volume of his sizing die.
A crude analogy would be as follows: A 200 lb individual can only get down to 70 lbs after radical surgery, while a 120 lb individual can get down to 50 lbs after identical radical surgery. The “limits” for each, if you will - are different.
I imagine that this could be explained by some Hysteresis Curve of sorts, but am at a loss at finding the specific topic which explains this behavior.
Is there any basic property with accompanying equations which readily explains such?
Thanks in advance.
I am trying to find a topic to read on which explains the behavior of brass during reloading (an activity that’s part of recreational shooting).
Shooters who handload recycle brass by refilling brass cases with new primers, smokeless powder, and bullets. But said brass cases need to be sized down to fit with sizing dies prior.
Let’s say that brass case fired from Person A’s hunting rifle gets ballooned by +0.002” longer than the chamber. The sizing die, set to a fixed volume suiting the tight chamber of Person A’s rifle, compresses the brass case down to -0.001” shorter than the chamber.
Now, brass fired from Person B’s loose chambered hunting rifle gets ballooned by +0.006” longer than the chamber of Person A’s rifle. Using Person A’s sizing die set to the same prior fixed volume suited to his rifle’s tight chamber, one can only compress Person B’s brass case down to +0.002” longer than the tighter chamber of Person A’s rifle. This is achieved after multiple compressions, gradually going from +0.004”, then +0.003”, and finally +0.002”… But there appears to be an asymptotic limit of sorts at +0.002”, never truly achieving -0.001”. Person B’s brass cases cannot be sized to fit Person A’s rife, unless Person A reduces the volume of his sizing die.
A crude analogy would be as follows: A 200 lb individual can only get down to 70 lbs after radical surgery, while a 120 lb individual can get down to 50 lbs after identical radical surgery. The “limits” for each, if you will - are different.
I imagine that this could be explained by some Hysteresis Curve of sorts, but am at a loss at finding the specific topic which explains this behavior.
Is there any basic property with accompanying equations which readily explains such?
Thanks in advance.