minimum length for 9 mm or any round

Questions, troubleshooting and tips relating to Lee turret presses

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pistolpositive
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Joined: Tue Mar 29, 2011 11:25 am

minimum length for 9 mm or any round

Postby pistolpositive » Mon Apr 25, 2011 2:45 pm

My guides have references to maximum length for a completed round, but no reference to minimum length. The rounds I have been loading, I have been loading to more or less match maximum or within .01 below. But my 9mm rounds are significantly shorter. Do I simply verify I have seated the bullet to a "proper" length and call it good. I was loading 115 grain FMJ.

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daboone
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Postby daboone » Mon Apr 25, 2011 4:46 pm

Here is a sampling from some references:
Lyman 0.751
Speer 13: 0.744"
Hornady (Sixth Edition): 0.749"
Hodgdon (2006): 0.750"
VihtaVouri (2004): 0.748"

Both Hornady and Speer list Max. Case Length as 0.754"

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Hawkmoon
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Postby Hawkmoon » Wed Apr 27, 2011 8:48 pm

But he's asking about COAL.

It's really a function of both the bullet shape/profile and your pistol's likes and dislikes. Over on the M1911.ORG forum a long-time reloader and bullseye shooter has a discussion somewhere about how to measure the straight portion of a bullet. His theory is that you want to get that measurement and then seat the bullet to a depth of just a couple of thousandths less.

As part of that whole discussion, we started compiling a database of bullet dimensions from raw measurements submitted by the membership. It's in a sticky post/thread in the "Ammo & Reloading" area at http://forum.m1911.org/forums.php . Unfortunately, at this point we have data only for .45 ACP bullets, but you can take a look at the data and get an idea from that just how much difference there can be, even between/among bullets of the same weight and general type (such as 230-grain FMJ).

daddyseal
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Postby daddyseal » Tue Dec 11, 2012 4:01 pm

Ammo makers are squeezing out profit by making brass cases short.
According to SAAMI, the min. case length on 9mm is 0.753
But as you see above from daboone some makers are Pushing the limits and making them short.
Not much to do about those.

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darwin
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Postby darwin » Tue Dec 11, 2012 7:28 pm

I have a column in my spreadsheet that measure how far a bullet is inserted into the case by using this formula

=((C7+0.888)-C9)

C7 is the length of the bullet, C9 is OAL, 0.888 is the length of the case.

This would allow one to always use the same case volume, regardless of bullet shape and length.


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