Trim new brass before neck turning??

[dodgefreak8]

I'm trying to take my reloading to the next level by neck turning my brass. I'm having the rifle built now in 300rum and it won't have a match chamber but I just want a consistent pull on the bullet. SO.... my question is.... I'm measuring my new Remington brass and they are all under the shortest case length listed for the cartridge. Should I trim them to a consistent length even if it's too short? It seems like it will have a pretty large affect on the neck turning depth. What does everyone do in this situation?

 

[The_FNG]

Yep, trim first so that they're all uniform before i neck turn.

 

[turbo54]

You must trim first, because the neck turning tool indexes off the case mouth.

If cases aren't all the same length, you'll find your turning operation won't end consistently in the same place each time.

 

[dodgefreak8]

So trim to whatever the shortest case is. Don't worry about it being under minimum case length. Thanks guys

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[witchhunter]

make sure you size first though.

 

[dodgefreak8]

Will do. Thanks

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[jfseaman]

I use a Forster Original with neck turning, indexes off the base same as sizing.

This is my procedure:
FL size with an over sized expander so the ID is the same size as bullet diameter.
Turn, for BR chambers to chamber spec, for standard chambers, skim/truing.
Neck size.
Trim to minimum length, even if only to true the case mouth.
Clean.
If the brass has a reputation for being 'hard' I anneal.
Champher and debur the case mouth.
Uniform primer pocket and debur flash hole. If not premium brass, flash and primer pocket work not necessary.

If I used a turning tool that indexed off the case mouth like a K&M or Sinclair I would:
FL size with an over sized expander so the ID is the same size as bullet diameter.
Trim to MAXIMUM case length or uniform length as long as you can get it.
Turn.
Neck size.
Clean.
If the brass has a reputation for being 'hard' I anneal.
Champher and debur the case mouth.
Uniform primer pocket and debur flash hole. If not premium brass, flash and primer pocket work not necessary.

 

[dodgefreak8]

I'm looking at purchasing the K&M tool. thanks for letting me in on your full procedure!