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Chamber Pressure
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Old 06-10-2006, 06:58 AM
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Default Chamber Pressure

Does an increase in 5% powder also increase the chamber pressure by approximately 5%? In working up loads for my '06 Ackley I find that I can easily increase the powder capacity by 3 grains of 4064 in the Ackley case or approximately 9% more powder. Will keeping the bullet the same distance off the lands result in a increase of chamber pressure by approximately 8% or is there no simple mathematical way to figure this out? The book shows 49 grains of 4064 with a 165 grain bullet results in 49,100 CUP. The book also shows 46 grains of 4064 results in a CUP of 41,000. My math figures this to be .089%

If I up the load 3 more grains, simple math shows the new pressure to be 53540. I know there are other factors, however, could I use this number as a general reference? I'm just trying to come up with some emperical data rather than inspecting brass and using stickey bullets as a guide to chamber pressure.

Side bar....haven't shot it yet ....still in pre-development stage making cases etc. Also, would appreciate Paul checking my math. Regards, Rick.
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