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September 22, 2023 - 2:39 pm
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Do you need to remove the barrel of an 1892 Winchester to cast the chamber?

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September 22, 2023 - 2:58 pm
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pine_worker said
Do you need to remove the barrel of an 1892 Winchester to cast the chamber?

  

No, you need to find a small funnel to fit inside the rcvr, unless there’s some gadget specially made for this purpose.  I’d check to see if there’s a Midway or other video showing the easiest way to handle it.  I’ve only done it with single shots, allowing the metal to be poured directly into the chamber.

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September 22, 2023 - 4:59 pm
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Make sure to block the barrel off just after the chamber.  Cleaning patches will work.

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September 22, 2023 - 5:07 pm
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Chuck, how long should you wait after you remove the case to mike its dimensions? Is there a time window for best accuracy?

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September 22, 2023 - 5:25 pm
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t=517s

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September 23, 2023 - 1:21 am
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Just watched the Cinnibar video, interesting!

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September 23, 2023 - 4:03 am
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To answer a previous question as to how long to wait to take accurate measurements. You will find that low melting temperature Bismuth based alloys such as those used in the video used for proofing dimensions all shrink very slightly when initially cast, usually about .001″ per inch, then stabilize to exact dimension in about an hour. The actual stabilization time will be determined by the mass of the casting.  After stabilization, they gradually grow to .0025″-.005″ per inch over an extended period of time. It’s best to know the exact alloy you are using then consult the manufacturer’s data sheet. We used a lot of this material at my shop for similar industrial purposes, and it works great. Just remember if you are looking for the best accuracy, don’t refer to old castings because of inherent growth. Make new ones… a sore subject.

Steve

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September 24, 2023 - 3:57 am
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seewin said
To answer a previous question as to how long to wait to take accurate measurements. You will find that low melting temperature Bismuth based alloys such as those used in the video used for proofing dimensions all shrink very slightly when initially cast, usually about .001″ per inch, then stabilize to exact dimension in about an hour. The actual stabilization time will be determined by the mass of the casting.  After stabilization, they gradually grow to .0025″-.005″ per inch over an extended period of time. It’s best to know the exact alloy you are using then consult the manufacturer’s data sheet. We used a lot of this material at my shop for similar industrial purposes, and it works great. Just remember if you are looking for the best accuracy, don’t refer to old castings because of inherent growth. Make new ones… a sore subject.

Steve

  

Thanks, Steve. It’s hard for folks like me to imagine a piece of metal changing dimensions but the behavior of Cerrosafe is well documented. The windows of opportunity are well defined. Maybe we need to invent a heated curved funnel to chamber cast old Winchesters.

 

Mike

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