Thread: Square necks
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Old 05-26-2019, 01:37 AM
SEM SEM is offline
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Join Date: Jan 2018
Location: Sac CA
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260, After rereading your post, I would agree with ray h don't trim, But I would use a good stiff load with bullet to really move the brass, I do a lot of case forming (since I cant be satisfied with standard cartridges) and used to trim to spec length before fire forming, Just to find most cases actually shrink as they fill out, The day I realized this after converting 200 shiny new FC 223 cases to 7mm TCU they shrank from 1.750 to 1.710 after the first firing and my chamber is 1.794 I went and looked back at all the different cases I make and how many were way short gave me something to learn and do over.

Last edited by SEM; 05-26-2019 at 01:40 AM.
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