Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
I didnt know so I googled it for all. From Wikipedia, the free encyclopediaamamnn said:O! my bishops!!!!!! how many grains of N-133 can dance on the head of a pin?????? If you don't get that reference then nevermind and use the 5% rule. any variation of anything measured--which is different from one sample to the others, bears investigation.
jlow said:Yip, some people clearly think weighing cases is a complete waste of time, others do not. However, the polite ones try not to insult the other group because it’s a free country and people should be free to do what they believe works best for them.
mikecr said:Sounds like all that's left for you is to ACTUALLY MEASURE your H20 capacities.
They don't always correlate with case weight.
CatShooter said:mikecr said:Sounds like all that's left for you is to ACTUALLY MEASURE your H20 capacities.
They don't always correlate with case weight.
If you know the volume of the brass, you don't need the volume of water, which will vary due to many factors that you cannot control.
What you indicated above is the reason why there is so much disagreement about the correlation between case weight and volume.mikecr said:Sounds like all that's left for you is to ACTUALLY MEASURE your H20 capacities.
They don't always correlate with case weight.
http://forum.accurateshooter.com/index.php?topic=3858496.0
mikecr said:If you change the Initial confinement from a case(regardless of it's weight), you can see a change to MV with it from a given load. Do you believe this?
If you use QL, and have it well calibrated to your barrel/powder lot, go ahead & fiddle with H20 capacity a bit and consider the results to both MV & barrel time.
I'll concede that H20 capacity variance may not be a factor with a gun running a pressure node. That is, the bullet is jammed, and running fast powder at extreme pressures, as with point blank underbores.
But with LR cartridges that are not jammed and running viable pressures, capacity variance would manifest similar to neck tension variance.
I don't have a scientific study to prove it, would like to see one.
It's just my notion I guess. I think initial confinement matters a lot.
dedogs said:After reading all of this the question I have is this: If the variations in case volumes fall with-in an accuracy node does it really matter? I realize that smaller cases accept smaller variations but wouldn't the variations be smaller also?
CatShooter said:Some rifles are so fussy that if clouds appear, the group goes to hell.
This is specifically the reason why I weight sort your brass. I recently dealt with a 3 grain Lapua 308 brass variation by buying 500 cases, weight sort them and dividing them into three batches which I will use separately. That way, there will only be a 1 grain spread within each group.dedogs said:After reading all of this the question I have is this: If the variations in case volumes fall with-in an accuracy node does it really matter? I realize that smaller cases accept smaller variations but wouldn't the variations be smaller also?