4 months ago 3 months ago

Powder burning-rate charts are not definitive

by Nick Harvey 4 months ago3 months ago

Q: How exact are those burning-rate charts which are included in nearly every reloading manual?

Can a handloader take them as gospel or are they only intended to give a rough idea of the quickness or slowness of each powder?

Ron Reed

A: Different lots of powder may burn at different rates, but depending on the lot number, propellants close in burn rate can overlap and change places.

Also, powders can change places on a chart as you change cartridges.

A powder that burns faster than another in a small case with light charge weights might burn slower in a bigger case.

So, no, burning rate charts only show approximate relationships.

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Posted by Nick Harvey

The late Nick Harvey (1931-2024) was one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He wrote about firearms and hunting for about 70 years, published many books and uncounted articles, and travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject was unmatched. He was Sporting Shooter's Technical Editor for almost 50 years. His work lives on here as part of his legacy to us all.