Is that becuse it is to grow that much?

Because when you resize the case- the expander ball inside the neck pulls on the neck- stretching the case as you draw it out of the die. If you don't trim "short" you may exceed OAL.

You trim BEFORE you resize?

I would think the reason for trimming .010" shorter than max is to allow one to load several (a few?) times before trimming would be required again.

There is no rule that says you have to trim .010" short, but if you trimmed to max allowable length, it would probably require trimming every time. That would be a pain IMO, but do it if you like.

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Life is more exitin' when yer stickin' suppositories inta a wildcats behind!

Clark, I trim before I size my cases because, with my Lyman case trimmer, the pilots won't fit inside the neck of a sized case...

Why, so you won't have to trim every time!! Like wildcatjunkie said.

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Larry

Doesn't the biggest part of case growth occur w/ FL re-sizing?

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May your chambers be true to your bores.

I size the cases, then trim.

A couple of years ago, my rifle's bolt didn't want to lock over some cases, and the only difference between those and the rest was that they were a little longer. Since then I always make sure all the cases do not exceed maximum length.

Could a longer than usual case shoved too far forward toward the lands cause problems? I have heard it can.

[This message has been edited by Ray, Alaska (edited 03-01-2002).]

Ray,
It can pinch the neck and tighter around the bullet and spike pressure.

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May your chambers be true to your bores.