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Author Topic: Partial sizing of 45 colt cases  (Read 889 times)

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Offline Muddly

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Partial sizing of 45 colt cases
« on: July 17, 2011, 01:59:08 PM »
In an effort to curb the high levels of breech sooting in my classic carbine, I'm only sizing cases far enough to hold a 300gr XTP. This leaves most of the case at fired demensions and has helped abit. Brass is bulged slightly and I hope another benifit of a partial resize is longer brass life. Anyone else do this and how's it working for you? I'm new to loading pistol calibers.
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Offline Savage

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Re: Partial sizing of 45 colt cases
« Reply #1 on: July 17, 2011, 03:20:52 PM »
Sooting is usually caused by low pressure loads. If partial sizing is working for you, great. I've never known anyone to partial size straight wall pistol cases. Live and learn.
Savage
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Offline Bigeasy

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Re: Partial sizing of 45 colt cases
« Reply #2 on: July 17, 2011, 04:15:36 PM »
What Savage said.
 
 Some low pressure loads tend to not expand the brass sufficiently to seal the chamber from slight blow back.  Unless it is extreme, it is really not an issue.  The one thing I would be concerned about is brass bulging to the point it becomes hard to chamber, though if it is working OK in your gun, then there is no problem.  I don't know if brass life would be effected much.  In a bottleneck cartridge, brass will tend to flow when you full re-size as opposed to neck size only, eventually weakening the web of the brass.  This kind of brass flow is much much less in a straight walled case.  When full length re sized straight wall cases eventually fail, it tends to be higher up on the case body, usually a slight crack, but not at the case web (Base)
 
Larry
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Offline Graybeard

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Re: Partial sizing of 45 colt cases
« Reply #3 on: July 17, 2011, 07:12:36 PM »
Tried it once many years ago not with a .45 Colt but with the .44 Magnum. One of the guys I shot with claimed doing so really improved the groups with his Ruger SRH. I was using a S&W 29 and a scoped 629. In both my S&W guns it actually made groups larger.

I sure wasn't doing it because my cases were sooting up but just to test Tim's theory that it made his Ruger shoot better. It sure didn't help in my S&W guns so I dropped the experiment and really hadn't thought much of it since.

I agree with the comments made already sooting is generally a low pressure issue but a really over size chamber also causes it especially in rounds that aren't running a modern pressure levels anyway.
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Offline crash87

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Re: Partial sizing of 45 colt cases
« Reply #4 on: July 18, 2011, 12:41:34 AM »
I did it once with one of my revolvers. With 45 Colt dimensions all over the map, and sloppy chambers in my Colt clone, I thought partial resizing a "fireformed" case might do, well, something, as nothing else was working as far as accuracy was concerned. I really didn't relize any difference. A different bullet and sizing die made it a shooter. crash87
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Offline Muddly

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Re: Partial sizing of 45 colt cases
« Reply #5 on: July 18, 2011, 06:50:20 AM »
Well, my RCBS dies dont work so good doing the partial resize. Very poor neck tension and she went from shooting groups to patterning. Full length sizing caused a bit of growth ( about .005) as it had to iron out .005 worth of bulge. Guess it had to go somewhere! My loads are low end Ruger/TC and judging by the nice recoil hickey, I dont really want to go any faster. 1350-1550 with a 250gr woud be sweet. I've heard about using Reloader 7 in the 45 Colt, but am having a hard time finding data. Any help appreciated!
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Offline SHOOTALL

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Re: Partial sizing of 45 colt cases
« Reply #6 on: July 18, 2011, 06:57:41 AM »
That's the way the Lyman 310 tool works as it only sizes part of the case. So its been done for a long time . If you have several guns you might find your loads don't fit all guns.
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Offline BCB

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Re: Partial sizing of 45 colt cases
« Reply #7 on: July 18, 2011, 02:53:23 PM »
I only size every straight-walled case just to the depth the particular bullet/boolit that I am shooting is seated...
 
Never had a problem at all...
 
And for "as cast" boolits, it will help eliminate the bulge that occurs with seating a large boolit into a fully sized case...
 
Good-luck...
 
BCB
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