Hey everyone,
I know lots of people sort their cases by weight. I weigh most lots of cases I use and I ignore the issue on some others, depending on my level of inspiration at the time. There have certainly been differences within given lots of the cases I've used. It occurred to me that I should check to see exactly where the dimensional differences are between cases instead of just assuming it always makes a difference in cartridge performance. That way, I can decide exactly how it affects inside case volume.
The simplest way I can think of to check this out is to chuck cases into my micro lathe and slice off a section at a a time - say 0.20" or 0.30". Then I'd note the weight and wall thickness each time I cut a section off. When I get down to the base of the cases, I'd measure the weight of the web and maybe the thickness.
I am curious to know if someone might have insight to add to get more information from the exercise, such as the number of cases I should chop to bits, distributuion of weight differences they've observed in their cases, etc. I'd be happy to post the results where everyone can read them.
Right now, I'm thinking to use 10 cases total per caliber, wherein 5 are closely matched in weight and the other 5 are each somewhere in a range of common weight variation. That might yield some interesting info.
I have been shooting Winchester .308s so that is mostly the brass I have. I also have Norma 22 PPC cases. The only unfired .308s I have left are cases I matched up very closely in weight. Therefore, I will have to beg or buy some new ones. I have at least 200 unfired Norma 22 PPCs left. If anyone would like to request a brand or caliber, I'd be happy to try to do it. If you have particular cases you want to see checked, I'd be more than happy to try to work them in.
One last thought: has anyone done this already?
I know lots of people sort their cases by weight. I weigh most lots of cases I use and I ignore the issue on some others, depending on my level of inspiration at the time. There have certainly been differences within given lots of the cases I've used. It occurred to me that I should check to see exactly where the dimensional differences are between cases instead of just assuming it always makes a difference in cartridge performance. That way, I can decide exactly how it affects inside case volume.
The simplest way I can think of to check this out is to chuck cases into my micro lathe and slice off a section at a a time - say 0.20" or 0.30". Then I'd note the weight and wall thickness each time I cut a section off. When I get down to the base of the cases, I'd measure the weight of the web and maybe the thickness.
I am curious to know if someone might have insight to add to get more information from the exercise, such as the number of cases I should chop to bits, distributuion of weight differences they've observed in their cases, etc. I'd be happy to post the results where everyone can read them.
Right now, I'm thinking to use 10 cases total per caliber, wherein 5 are closely matched in weight and the other 5 are each somewhere in a range of common weight variation. That might yield some interesting info.
I have been shooting Winchester .308s so that is mostly the brass I have. I also have Norma 22 PPC cases. The only unfired .308s I have left are cases I matched up very closely in weight. Therefore, I will have to beg or buy some new ones. I have at least 200 unfired Norma 22 PPCs left. If anyone would like to request a brand or caliber, I'd be happy to try to do it. If you have particular cases you want to see checked, I'd be more than happy to try to work them in.
One last thought: has anyone done this already?
