Partial sizing the neck

[Boomer79]

I ran a search and found this topic discussed about 4 years ago. What is the latest thinking? Is there an advantage to partial sizing the neck of a fire formed case so that it more accurately aligns in the barrel?

 

[BoydAllen]

Different components and rifles respond differently requiring individual assessment using a time tested measuring tool....comparing results on targets.

 

[TheSnake]

Different components and rifles respond differently requiring individual assessment using a time tested measuring tool....comparing results on targets.

Hey Boyd,
I know you can probability advise on this followup. I am partial neck sizing on several rifles and having very good luck. If I continue to do so, is there any chance of abnormalities forming at the shoulder to neck junction down the road? I have not been doing this long enough to know. Thanks.

 

[BoydAllen]

I don't think so.

 

[artbosco]

Is there an advantage to partial sizing the neck of a fire formed case so that it more accurately aligns in the barrel?

You almost got it right. Think ... in the chamber ... not in the barrel.

Tony Boyer leaves approximately 30% of the neck/shoulder junction unsized to improve the alignment of the case in the chamber.

See: Partial Neck Sizing, at the bottom of page 116, of his new book, The Book of Rifle Accuracy.

 

[Boomer79]

Thanks for the advice.