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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/10/2012 at 23:54
tejas View Drop Down
Optics Journeyman
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    After two to three reloads (neck sized only) my 30/30 cases are stretching to the point of making it difficult to chamber them.  I know that cases stretch and periodically you have to full length size them to push the shoulder back. I'm not sure if this holds true with rimmed cartridges though, since they headspace on the rim instead of the shoulder. I'm loading these in a T/C Contender. Does anyone know if the shoulder of a rimmed, bottlenecked case is supposed to actually be against the inside of the chamber? It seems that if it is, the rimmed portion would stick out too far causing the cartridge to headspace on the shoulder instead of the rim as it was designed to. I'm trying to avoid FL sizing the cases because they shoot pretty well being neck sized.

Thanx
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 07:40
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Chief Sackscratch

Joined: December/17/2009
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Are you trimming them at all?

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 07:54
tejas View Drop Down
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I have a friend who shoots Hornady Lever Evolution in his Marlin Lever Action. I got the brass from him, tumbled, trimmed and full length sized all of it before I started trying to come up with a good load in my T/C. At that point, all the brass was fine. I made 10 different loads of five rounds each, using different bullet weights and powder charges. After firing these I did NOT trim. I tumbled the brass and neck sized it. I suspect that firing different weight bullets and different powder charges caused the brass to stretch on some cases more than others. I wouldn't have thought it would be to the extent of causing the shoulders to touch the chamber though.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 07:57
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Optics Apprentice
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Joined: November/04/2008
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For reloaders working with bottle neck cartridges, the FL die should be set so cases 'headspace' at the shoulder; rimmed, rimless or belted.   The chamber pressures of the old lever cartridges is so low they rarely need anything but neck sizing but I suppose it does happen.  If so, FL size 'em.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 08:15
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Chief Sackscratch

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I'd trim then neck size and  see what happens.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 08:35
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Optics God
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  How are you expanding the necks after sizing them? 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 09:34
Dale Clifford View Drop Down
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biggest problem with T/C and shoulder headspacing, is if you don't get it just right the gun is very difficult to close, and if forced jams the shoulder into the chamber. Use to have this problem alot when using a 7/30 waters in IMSHA. Usually partially FL and trimming worked best. Pressures run quite abit higher in T/Cs than levers, and loading for them is very different than levers. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/11/2012 at 22:55
tejas View Drop Down
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    Tried trimming this afternoon and loaded a couple of "dummy rounds".  Didn't help. They are still tight as Dale mentioned above. The problem is, not all of the cases are tight. I suspect that the ones that are, are the ones that I had previously loaded with the heavier bullets.  I guess, what I'll try next is to go ahead and FL size all of them again and load some up that looked promising before. This time, after I fire them I'll keep the cases separated so that when I neck size next time, all the rounds with each given load will have expanded the same amount. When i neck sized these last time, I had some that chambered easily and some I had to force. I'm thinking if they don't all chamber the same, they aren't going to be consistent anyway, even with identical loads.
   Thanks for all of your input.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/21/2012 at 14:16
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Optics GrassHopper
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Use your full length sizing die to bump the shoulder back just enough so the gun will close reliably.  Go a little at a time (1/4 turn) until everything is back to normal. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: June/24/2012 at 18:18
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Optics Apprentice
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"Go a little at a time (1/4 turn)"
 
Go a little at a time is correct but a quarter turn is massive; that's very close to 16 thousanths of change.  The full range of headspace tolerance for bottle neck cartridges is around 6 thou, being about one third of the shoulder change a full quarter turn will make!    Bandito
 
 
Belted, rimmed or rimless, all bottle neck cartridges need to be sized the same; just enough to set the shoulder back for easy chambering.  And no more than that.
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