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Old February 16, 2012, 01:56 AM   #1
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What's your tolerance with OAL?

I am currently loading up some 155 gr 40S&W flat points on a Lee turret press. I set up my die to about 1.129" OAL. I am noticing that from round to round I will get anywhere from 1.1285" to 1.134" -- the ones that have been running a little long I just run it another stroke on the seater die and its usually spot on. My personal tolerance is I'm okay with any round that is between 1.1285" and 1.1305". Is this reasonable or should I be less forgiving?

I loaded up 150 rounds and all of them where within this tolerance. I checked all of them and they cycled through the pistol perfectly. I will be shooting them Sunday.

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Old February 16, 2012, 02:07 AM   #2
Jammer Six
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I use a Dillon Square Deal.

Talking with Dillon support, the machine is only accurate to ± .007, which gives a range of .015.

So I set a COL, and if the round measures to that COL ± .007, I'm happy.
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Old February 16, 2012, 02:21 AM   #3
Zach W.
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1.129" to 1.131" is awesome for a high speed cranck em out, if you ask me.
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Old February 16, 2012, 04:33 AM   #4
Dr. Strangelove
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Sounds good to me. Shoot 'em.
Just remember, when you pull the trigger, the bullets come out going very, very fast. So make sure to keep the weapon pointing away from you.
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Old February 16, 2012, 05:18 AM   #5
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For an OAL of 1.129 I would keep it between 1.124 and 1.134.
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Old February 17, 2012, 02:25 PM   #6
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For me, anything up to +-0.005 is fine. Though in general I find it pretty easy to keep it within +- 0.002
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Old February 17, 2012, 04:37 PM   #7
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It's not the press or dies that cause the variance. It is the shape of the bullets.

It's due to where the seater stem touches the bullet. The ogive (first part wide enough to touch rifling) is not in the exact same place on every bullet.
This is still ok and accuracy won't suffer due to this factor alone.

Imagine 10 men all 6' tall, but with different shoulder heights. The die is seating by the shoulders, not the top of the head.
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