Brass prep for 7mm TCU? - Graybeard Outdoors
 
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post #1 of 6 (permalink) Old 08-20-2019, 01:01 AM Thread Starter
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Default Brass prep for 7mm TCU?

Iím new to this cartridge and will be sizing and fire forming new 223 brass for use in a Thompson Contender.
When doing the initial sizing and neck expansion is it better to use a full length die or a neck die?


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post #2 of 6 (permalink) Old 08-20-2019, 01:14 AM
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I'm also new to the 7mm tcu but I have tried both ways. While waiting on my barrel and dies to ship to me I decided to get started on brass with a 7mm neck die that I already had. I got a good bit of necks that weren't straight with it out of the 50 that I did so I stopped and waited on the 7mmTCU dies. I did 50 more with it and had a lot less of an issue while using the full length die.

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post #3 of 6 (permalink) Old 08-22-2019, 09:22 PM
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I didn't have any commercial 223Rem brass to use for my 7TCU, so I went against the common advise and sized 5.56 Lake City brass in a 7TCU full length die and loaded them up. I have good accuracy and no apparent problems with the dies or the brass. If you would like my handload recipe just ask me. It is probably more accurate than I am shooting this 10" contender.
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post #4 of 6 (permalink) Old 08-22-2019, 10:12 PM
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my best advise to you is don't waste your time with 223 brass, go to Star Line brass and buy there blank 223 brass, if you end up doing so I can talk you through the steps, you will end up with brass that best fits your chamber really worth the extra cost and effort. actually not much more effort just necking down instead of up






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Last edited by SEM; 08-22-2019 at 10:15 PM.
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post #5 of 6 (permalink) Old 08-22-2019, 10:17 PM
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as far as your die question NECK die and DO NOT trim the brass length you will not need to
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post #6 of 6 (permalink) Old 08-22-2019, 10:24 PM
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Quote:
Originally Posted by Luckyducker View Post
I didn't have any commercial 223Rem brass to use for my 7TCU, so I went against the common advise and sized 5.56 Lake City brass in a 7TCU full length die and loaded them up. I have good accuracy and no apparent problems with the dies or the brass. If you would like my handload recipe just ask me. It is probably more accurate than I am shooting this 10" contender.


The original cases used by Uglade in his article were FC who makes LC brass also, I have seen more LC converted to 7 TCU than any other maker and have used LC brass for years, Until I found Star Line blank 223 brass that is
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