I was just thinking that breach seating at the range all that is needed is one good case. why couldn't I make a 32-40 case on my lathe with say the same capacity as the 32-20 and used a much lower powder charge it might be possible to increase accuracy and case life. now I do know case life isn't a problem as they last almost forever. I keep reading about the benefits of smaller cases and lower powder charges. I am sure I could make a case, however I have no idea if I could use regular 360 brass or would need another alloy. this is something I would like to try. questions?? would I gain anything? what kind of brass to use?  question one can only be answered by trying it to see. I am hoping someone on the forum knows the answer to the type of brass alloy. 
Joe G

thanks for your information. what kind of results have you had with the reduced capacity cases??  you are doing exactly what I was going to try 1/4 inch and larger at case mouth. I am not sure why it needs to be larger but it would push on the bullet bottom equally if it were. joe

This interests me as I'm shooting a 38-55 with reduced loads and this leaves lots of air space between the smokless powder load and the base of the bullet.

Can someone post a quick drawing of what you are talking about before I head out to the lathe and make something and hurt myself.....

Its easier to just have RMC make you a batch of cases. What you are talking about doing is what they have been doing for several years. Design what you want and they will make it. I have tried their reduced capacity 32-40 cases for both SR and LR primers and I did not notice any increase in accuracy but just the opposite. Also if the cases are not an extremely close fit the gas blow by will collapse the mouths on the first firing / case ruined and primer pockets did not last very long. These cases do not exspand and contract like a factory case and are quite brittle. Depending on the extent of the reduced capacity a wad over the powder might be required to get the case in the chamber without spilling powder. 

JLouis

This brings up an interesting question about the influence of the internal shape of the case on burn consistency. Any confined combustion process can be tuned by changing the shape of the confined space. A complication is the random distribution of powder granules, but making the chamber the right size for a consistent fill should help with a consistent burn. Then the issue arises as to the actual dynamics of burning once ignition starts the pressure rise and combustion progression in the confined space. I suspect that there is a lot going on that we don't necessarily know about of understand about the combustion cycle of internal ballistics, but I would think that the shape of the chamber might influence how the burn progresses and hence how the bullet progresses up the barrel, which is now vibrating and distorting as a result of the pressure changes. It may be enough to have consistency in the burn cycle, but there might be internal chamber shapes that promote an even consistent burn, while others promote spikes in pressure from shock waves concentrating or reflecting in the chamber and barrel area. How to find out? I don't know, assuming that chamber shape variations could be close to infinite. Taper, base shape, internal angles, etc., might all influence burn dynamics. So many variables, so little time...

RMC has always made Everlasting type cases and they do reduce capacity, some what. 

The shooter that I was refering to asked about reduced capacity, relating to a extended solid case head. In other words, a short powder chamber. I don't believe the man was l lying when he told me they wouldn't do it for him.

You could call and confirm it one way or the other. Doesn't matter to me, as I make my own when needed.

John,
Some people just like experimenting, I would never discourage that. It's both fun and you can learn from it, whether good or bad, right? What can you learn by doing the same thing over and over for 150 years?

Frank

for reguced capacity why not just make the interior base_ web longer?  that would reduce the length of the powder column.   art

John, has anybody you know tried front ignition with the paltry powder loads we use? I don't recall any that I've read of that weren't for big-time cartridges. What happened if you have heard of any in reduced load shooting? You know, me; always curious.