Different propellents have different burn rates.

Propellent Burning Rate


Q: I know that there are two basic types of rifle powder, single- base and double-base, but little else. Can you tell me the difference between single and double base powders and what is done to vary their burning rate? I’ve just set out to reload my cartridges and would like to learn a little about propellant powders.
Jeremy Fisher

Different propellents have different burn rates.
Different propellents have different burn rates.

A: Single-base powder has only one component, nitrocellulose, whereas double-base powders have two – nitrocellulose and nitroglycerine. The latter has the most energy. The size and shape of the powder granule, whether it is porous or solid and the application of various deterrant coatings govern burning rate. Winchester double-base Ball powders are harder to ignite than other types, due to their having heavier deterrant coatings and lower flame temperatures. They are best sparked off using magnum primers. Most powders have a pressure range at which they burn best. If that level isn’t reached, you get even more unburned powder than normal, higher velocity spreads and sooty cases.

 

 

 


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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.

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