fire-formed brass shorter than trim-to length

[fat_46]

I just finished fire-forming 160 rounds of 22-250 AI. The parent cases were all virgin WIN 22-250, full length sized, and trimmed to 1.902"

After fireforming and neck sizing the "new" cases are very consistently measuring 1.896

Is this anything to worry about?

Thanks in advance

 

[expiper]

nope ...that is typical....Roger

 

[Preacher]

The new case needs to expand to fit the new chamber, and the brass needs to come from someplace, so it gets shorter.....

 

[SmokinJoe]

The only thing I might add is to get a chamber length gaging insert from Sinclairs & see what the real chamber length is. If it's long enough,which they frequently are) to fireform safely without trimming, do it that way. Then trim to uniform/ideal length after fireforming.