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Old July 26, 2001, 01:49 PM   #1
Sling Shot
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Vented test barrels?

Some ammo manufacturers claim to use the vented barrels when listing chronograph results of their ammunition. What is a vented test barrel? Sling Shot
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Old July 26, 2001, 02:14 PM   #2
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A test barrel that has a hole or slot cut in it to simulate the loss of pressure caused by the barrel/cylinder gap in a revolver.
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Old July 27, 2001, 06:40 AM   #3
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Vented test barrels?

Vented test barrels give different results that firing the same round through a REAL GUN. A real gun gives lower velocity than a test barrel. These are similar to Contender results.
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Old July 27, 2001, 09:06 AM   #4
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.....but regardless of the manufacturer's test proceedures, what matters is the velocity from YOUR gun.

I know, I am one.

(I have chronographed enough ammo to KNOW that the exact same brand/model/barrel length guns can give tremendous variances in velocity, accuracy, and (obviously) pressure.
"all my ammo is mostly retired factory ammo"
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Old July 27, 2001, 09:56 AM   #5
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What WESHOOT2 said, he speaks from current manufacturer's standpoint.

Plus. Two guns of same make, model and production lot will be different. Different chamber and bore dimensions. Different internal finish quality. etc etc.

How a load does in a test gun gives a relative reference point. How that load does in YOUR gun is real data.

That is why one should carefully work up to "hot" loads and do the testing in the actual gun that is going to use that ammo.

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