Just to add a new wrinkle (no pun intended) I would inquire whether the shooting folks are talking about is with smokeless or black powder?  I ask because with Civil War era rifles and repros used for skirmishing, if they were originally percussion fired cartridges such as the Maynard, turned brass is about all the brass that is available.

My Maynard brass has all been fired quite a few times (probably 15-20 for most batches) and a good friend has some that has over 100 firings.  It occasionally needs to be sized either to hold the bullet or more likely because it has grown too large a diameter to enter the chamber.  Neither or us has ever had a case fail under the situation described.  Just curious as to how this all fits the discussion??? 

Froggie

Wow!  Look what I started!  Very good stuff.  The only other experiance I have had with turned cases, are those I turned up from bar stk. for the .577 Snider & .577/.450 Martini-Henry.  These were closer to "everlasting" cases..as I did a chamber cast & turned to .001" so as not to have to resize.  The .450 M.H.  was made with reduced capacity..70gr. instead of 80+ of originals..leaves nearly 1/2" stock in head area & LONG flash hole!  It is my understanding that a turned case, as compared to a drawn one, is more like a casting..there are no "flow lines".  Very good stuff guy"s!

Brass continued

I am not sure why some individuals have great results using drawn and turned brass and some do not,
I have sent  turned cases to customers that had a problem with them and had them return them for a refund, and then sent the same cases  to another ,and they were thrilled with them.
As with all cases they have to be the correct size for the chamber they are going to be used in and they all have to be maintained for maximum case life by annealing correctly from time to time
The amount of work hardening varies with each individual set up , the more the case is moved in each loading, fireing sequens,e the more often the case will need annealing on the neck. How often? that is a variable you have to find out for your respective  use.  All the pieces of the puzzle need to match for maximum performance   dies must match the chamber as well.
For the ability to form  C360 brass, it is very malleable when annealed correctly, for an example when I make 577-450 MH cases they are .585 ID at the neck and are formed down to .458 in two different dies thats .119 change in dia if you do the math.
Being turned, the case will have a very slight machine mark on the case wall but that is not a problem unless your chamber is changed from age and neglect or altered in some way from its original new condition and size or is not polished well  I typically polish chambers with 600 grit when I cut a chamber and have never had a case stick 
The mark from turning is virtually gone after two tumblings if you use a tumbler on your brass.
As with every thing there is nothing that will last forever, I have factory drawn brass that has failed sooner than turned cases and also the other way around.........
For the longest brass life, the closer the case fits the respective chamber, and the correct mainenense of the case, will give you the best case life be it a drawn or turned case.
Thanks,
Dave Casey

Mike,
I do not know of a conversion either, The figures I have quoted are from the brass suppliers technical data and also the material data sheets I recieve with each order of brass for composition and alloy certification from the mill  who supplied the brass.
Also on the price difference, from drawn brass compared to turned brass, Yes, there is quite a bit due to the fact I start with a piece of brass , and remove the majority during the machineing,in chips, leaving in some instances ,1/3 or less than I stated with, and at just shy of $5.00/ lb  that adds up very quickly, especially with large size cases. 
I do recycle the chips but only get cents on the dollar as compared to the initial cost, and is factored back into the price.
The benefit is the ability to offer a case to a very specific dimension when required ,that cannot be achieved with a drawn case  unless it is dimensionally close to start with.
Then if you fiqure your time in for the alteration, turned cases dont look so bad in comparison...................

Dave

Dave, thanks--I can now see through this muddy water--I was having a hard time believing that machined brass was somehow weaker than[not as good as]  drawn brass.  ledball

Not sure, but I read KSI as thousands of PSI, 20 KSI =20,000 PSI. Would guess the base of a drawn case is closer to full hard than half hard. Full hard is significantly stronger. Not sure it makes any difference for the kind of pressures we are talking about.
Chuck

Text on photos to follow

Text on photos to follow