Why Does Reloading Data Vary?

Sierra Bullets

 Written by Sierra Bullets Ballistic Technician Paul Box

Everyday we get calls on our 800 line about why does data vary from one manual to another? It’s an honest question and we’re going to take a deeper look into why this happens. The short answer is tolerances, but let’s see what this means.

Everything in this business has a tolerance to stay within. Let’s look at powders first and use IMR-4064 as an example. When the powder manufacturers make a lot of powder, it will be tested  to make sure the burn rate is right. Again, just for example let’s say it must fall between one and ten on a scale. The first lot comes in at eight and the second lot at three. They are both within spec, but the second lot is slightly faster.

Brass will be the same way. There will be differences in case…

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