Primer Pressure Signs

JimT · Post by **JimT** » Thu Mar 20, 2008 11:29 am

The thread about primer indications of pressure made me dig out some of the old stuff.

Which cartridge had the highest pressures?

The one on the left was a factory 210 gr. load fired in a .44 Magnum.

The middle one was an overload that bulged the chamber in a Ruger .41

The one on the right was a standard load.

An old page from a 1940 Lyman Reloading Manual .. the article is how you cannot tell pressures from the appearance of the primer.

I apoligize for the poor photos ....

Ben_Rumson · Post by **Ben_Rumson** » Thu Mar 20, 2008 3:44 pm

Thanks Jim

Nath · Post by **Nath** » Thu Mar 20, 2008 3:53 pm

Thanks Sir, reminds me of using blue dot in 22 hornet. The primers looked fine so I tried 1/4gr more and then the primers started falling out

Nath.

Bigahh · Post by **Bigahh** » Thu Mar 20, 2008 6:19 pm

If I were to guess which one had the highest pressure just by appearance, it would be the factory .44 mag on the far left.

Pisgah · Post by **Pisgah** » Thu Mar 20, 2008 6:57 pm

Bigahh wrote:If I were to guess which one had the highest pressure just by appearance, it would be the factory .44 mag on the far left.

I do believe that's a .41 that was fired in a .44.

1886 · Post by **1886** » Thu Mar 20, 2008 8:03 pm

Primers can be real tough to read esp. in a hand gun or other relatively low pressure chambering. 1886.

sore shoulder · Post by **sore shoulder** » Thu Mar 20, 2008 9:13 pm

The one I like is folks looking for primers backing out with 45-70 loads that are around 40,000psi. I always like to ask how much the primers back out or flatten in a ruger #1.