chamber and barrel casting ? - Graybeard Outdoors
 
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post #1 of 10 (permalink) Old 01-17-2020, 03:35 PM Thread Starter
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Default chamber and barrel casting ?

I would like to make a chamber casting of a 12 gage shotgun barrel and about 10 inches of the barrel so what do I use that sets up hard easy to get out that I can use to get some measurements for doing a barrel stub project I do not have an inside mike and a casting might give me a better Idea what the turn barrel would look like.

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post #2 of 10 (permalink) Old 01-17-2020, 04:32 PM
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Youtube cerrosafe
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post #3 of 10 (permalink) Old 01-17-2020, 06:52 PM Thread Starter
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As big a cast as I wont to make might take a couple of those.

With the barrel off it seems like it would be easy to do is there something a little cheaper what about plaster of paris?

Deaconllb

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post #4 of 10 (permalink) Old 01-17-2020, 08:24 PM
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Paraffin if you're not too particular with the dimensions, cerrosafe or one of the comparable products is best. It is reusable, so not wasted. You can get a gauge set at Harbor Freight or Amazon for under $20, then measure with a caliper.

Tim

https://www.harborfreight.com/6-piec...-set-5649.html




https://www.rotometals.com/chamber-c...IaAivpEALw_wcB

https://www.ebay.com/i/163989955062?...oaAh7qEALw_wcB

https://www.midwayusa.com/product/1007021082?pid=462291

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post #5 of 10 (permalink) Old 01-17-2020, 08:49 PM Thread Starter
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Thanks Tim.

Deaconllb

U S Air Force Korean vet. NRA Member
Fourth fighter wing Kimpo Korea 1952 Fourth but first, the mig killers.
533rd material ,air defence Oxnard AFB 1953-1955
Pastor of the CBCG-Fellowship group Tulsa Oklahoma.
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post #6 of 10 (permalink) Old 01-17-2020, 11:42 PM
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If I understand correctly Cerrosafe has a relatively low melting point . After solidifying, it shrinks as it cools, then maybe a half hour later expands to the dimension it had before cooling. This permits 1) removal from the barrel chamber and 2) accurate chamber cast measurement.
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post #7 of 10 (permalink) Old 01-18-2020, 06:46 PM Thread Starter
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Yes that is what I get from all the ads and you tube video

Deaconllb

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533rd material ,air defence Oxnard AFB 1953-1955
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post #8 of 10 (permalink) Old 01-21-2020, 12:35 PM
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Quicktdoo: Thank you for the Rotometals tip, chamber casting alloy at substantially lower cost than either Brownells or Midway.

I just ordered 2 lbs.

Deacon: When it gets here I will calculate the volume of each 1 lb piece so you can compare to the ?13" of 12 gauge chamber and bore volume you are thinking about casting.

Bill

Last edited by M134 Troll; 01-21-2020 at 12:39 PM. Reason: change
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post #9 of 10 (permalink) Old 01-21-2020, 01:25 PM
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Cerrosafe is all I ever use or trust.

It's very easy to use and easily melted, using my kitchen stove.

DM

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post #10 of 10 (permalink) Old 01-27-2020, 12:51 AM
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Deacon, Rotometals chamber casting alloy 1 lb ingots are approximately 4" x 1 1/4" x 1/2". So about 2 1/2 cubic inches each. Rotometals chamber casting alloy is less expensive than Cerrosafe.

v = pi x radius squared x h so 3.14 x .3645 x .3645 x 13= 5.4 cubic inches. You'll need at least 2 ingots to cast a 12 ga chamber and 10 inches of barrel. I would get 3 ingots and melt 2 1/2 ingots for the cast pour. Get the melt good and hot....heat another 30-40 seconds after all the ingots melt. Pour enough melted alloy so that there is a substantial meniscus above the chamber mouth. There will be shrinkage at the first 16th of an inch of the chamber mouth which will prevent accurate measurement of that part of the cast if there is not a puddle of molten alloy above the mouth of the chamber. Now if you pour too much the meniscus will break and flow down the side of the barrel....no harm done but the cast may shrink too much at the chamber mouth.

I used a clean soup can and a propane torch to melt the alloy. Bend a small pour spout in the lip of the can with pliers and use channel locks to grip the lip of the can for heating and pouring.

Good Luck! It took me 5 casts to get the hang of it. Fortunately the alloy is reusable.
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