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Another research paper on primers plotted pressure and velocity as caused by various primers against ambient temperature, utilizing various powders. These were standard primers as well as magnum primers. At higher temperatures, the differences the primers made were very small and largely powder dependent. Only at lower temperatures did primer performance show large variations independent from the used powders. Interestingly, the Fed 215 was the only primer that kept its ignition power well into 'cold' territory, all others dropped of steeply as 0 degrees Celsius was approached. At 40 degrees Celsius, all primers showed more or less the same performance.

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Actually i have seen charts where the fed.215 gives about 20-25% higher pressure and are 35-50% faster from -50 to +50 celcius then the cci250.

But if it does any difference depends as you say on the specific cartridge and powder/bullet chosen.

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Andreas

"Yeas it kicks like a mule he said, but always remember that its much worse standing on the other end"

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