Case trimming

[deadwooddick]

47L, no turn, not hot, Lapua brass. Is it necessary to trim the .001-.002 growth that occurs w/ first loading? Currently on 4th loading w/ no further growth ?

TIA

 

[Patch700]

Have they ever been trimmed? How close are you to 1.840"? I have seen lengths get shorter when only neck sizing (bushing die , no expander used) but then the same cases would grow particularly in the shoulder datum area when FL sized to the point prior to where they would just start to bump.

I guess if it ain't broke don't fix it so long as you are sure you have uniformity in your lengths and have mouth clearance.

 

[artbosco]

47L, no turn, not hot, Lapua brass. Is it necessary to trim the .001-.002 growth that occurs w/ first loading? Currently on 4th loading w/ no further growth ?

TIA

Trim all brass initially to the shortest dimensioned case. After that, whatever suits your proclivities.

 

[timbo762]

As long as the maximum length is not exceeded, there's no reason to trim from a safety standpoint. If you want total uniformity or crimp your bullets, then you'll need to trim as necessary to maintain what ever length you've decided on.