Morning,
I have always run my new brass through the RCBS sizing die prior to priming, belling, and so on. Is this necessary on new brass, or am I just wasting my time?
Thanks
Ken
I have never used brand new brass, will it fit inside your case gauge?
I only do it with bottleneck rifle cases to remove any dents in the case necks and to ensure the case mouth is round to accept the bullet. I don't do it for straight walled pistol cases unless there is a visible problem.
My new Starline fits into the go-nogo gauge, so no sizing is needed....
The belling of the brass is as you don't want the case to scrap off plating/coating as it enters the case... can also cause wrinkled brass if to tight as it can bind... less bell is better if no issues ( use the least that works )
New Starline 10mm brass doesn't have to be run through the sizer die as its not going to really do much. They usually are sized at 0.4215" - 0.4220" at the start of the extractor groove where as most sizing dies leave this area untouched and only size to about 0.4225" - 0.4230" anyway.
The expander die will straighten the case necks, but if you happen to find loose fitting bullets you may want to run your brass through regular sizing dies.
I see 0.4230" when I do pass through sizing with my Lee FCD's carbide ring with used brass.
Great, Thanks!
While it is not necessary to size Starline new casings, I do so as to ensure uniform case dimensions and uniform taper crimp.
Thanks, last new batch of SL went unsized and was fine, but still feel better doing it, Personal problem I'm convinced
I find new Starline brass to be tight after I size and expand it. It feels tight when I seat a bullet. Makes me wonder if the tight grip the brass has on the bullet increases pressures a little. Maybe it's just the batch I have. The second loading is different.