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Does minimizing throat jump improve accuracy of 9mm luger pistols?

This is a discussion on Does minimizing throat jump improve accuracy of 9mm luger pistols? within the Ammo and Reloading forums, part of the Gun Forum category; Does anyone who reloads here try to obtain the best "throat jump" when choosing or creating a load recipe for 9mm (or any pistol for ...


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Old 04-20-2017, 08:53 AM   #1
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Does minimizing throat jump improve accuracy of 9mm luger pistols?

Does anyone who reloads here try to obtain the best "throat jump" when choosing or creating a load recipe for 9mm (or any pistol for that matter) ?

I ran across the concept in the article referenced below and I am wondering if this is a good reason to try and use recipes that call for the max COAL in order to minimize the distance between the ogive of the bullet and the lands of the barrel.

It could also be the case that this does not really pertain to pistols.

Here is the article (it has two parts):

Effects of COAL and CBTO | Part 1 | Berger Bullets Blog

Effects of COAL and CBTO | Part 2 | Berger Bullets Blog

Regards,
-John
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Old 04-20-2017, 10:40 AM   #2
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I've never done it with handguns, but have experimented with it pretty extensively with precision rifles, and it sometimes made a huge difference there, but not always.

Every rifle is it's own separate thing.
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Old 04-20-2017, 11:56 AM   #3
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What flash said.
I do it for precision rifles only.

warning warning
John, you had 200 rounds fire 100%, do not touch anything on your seating dies.
The wrath of God will decend on you, your hair will fall out, your car wiil throw a rod, cow will go dry and hens quit laying.
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Old 04-20-2017, 12:01 PM   #4
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Not to mention the fact that the fleas of a thousand camels will nest in your nostrils.
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Old 04-20-2017, 12:16 PM   #5
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We're going to have to keep a close eye on him.
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Old 04-28-2017, 04:23 AM   #6
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Ya'll crack me up


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Old 05-03-2017, 05:01 PM   #7
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I have actually found better accuracy with shorter OAL's in 9mm.
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Old 05-19-2017, 06:11 PM   #8
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You guys are funny... but yeah, if what you did is working well, don't touch a thing!

COAL is important, when following a recipe, because of volume in the case behind the bullet, and managing pressures. If a reputable loader specifies a projectile and powder combination, and lists a OAL for that combo, it's likely that they have found the best velocity for that combination, within safe limits.

So, trying to seat longer to close the gap will change the performance. I would be willing to bet that any potential improvement would be mitigated by the change in powder performance.

If I were loading for maximum accuracy, I would sort my brass by brand, then sort by length of case, then pay close attention to my crimp.

Hope this helps!
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Old 05-20-2017, 05:05 AM   #9
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In rifles, I've never found the reloading data COAL to have the best accuracy and that's understandable as all guns are a law unto themselves and what's accurate in one probably won't be as accurate in the next one.

I've observed this a number of times in my life, the most blatant example being when I was 17 and my best buddy and I each bought .30-06 rifles. They had consecutive serial numbers and appeared identical.

I worked up a load for mine, and got great accuracy. Then we tried it in his and got patterns instead of groups.

That's pretty much normal.
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