Primer pressures

[longwinters]

Read an article out of Reloader a while back.  It talked about primers and how different namebrands caused considerable differences in pressures.  The extreme was 10.000 psi

This info was worked up by using the same bullet, case, powder etc... with the only variable being the primer.

So, would this info be consistent with all calibers and loads?  If a Winchester primer causes more pressure in a 7mm than a Federal, would the outcome be the same in every caliber?  If so is there a list somewhere of primers listed "hottest to least hot"?

Long

[Catfish]

Hotter primers always have a faster presure curve than slower primers. the highest spike in the presure curve will always come faster than with a colder primer but the max. presure also depends on the buen rate of the powder. The higher the burn rate of the powder the faster the presure max. is reached, so hot primers with fast burnning powders really puts the presure up fast. This may be a good thing with very small cases as max. velosity can be reached, but with higher volume cases dangerious presures come with very lite loads. The best advice I can give you is to get a good redoading manual and stick with what it says. I`ve been loading my own since the 1960`s and play with several different wildcat that have no reliable data for them and rely on presure signs to work up loads, but playing on the edge like this is very dangerious and definately not for those that without a very good understanding of internal blistics.

[Mac11700]

FWIW:

http://www.castingstuff.com/primer_testing_reference.htm

It might help...it might not..

Mac

[longwinters]

Thanks for the info guys.  It is quite helpful.

Long