Clark
Member
CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.
I have worked up 9mm to the threshold of case failure, and that takes an extra 4.5 to 6 grains of powder.
If I work up with a magnum primer, the threshold of failure is ~ .7 gr less.
The magnum primer raises the pressure like .7 gr of powder, but does not raise the velocity like .7 gr.
The threshold of intolerable recoil is 2 to 4 extra grains of powder.
The practical limit of 9mm is the recoil, not the pressure.
The magnum primers have a thicker cup, and take a little harder strike to set off, but most any 9mm is up to it.
What does it all mean?
Using magnum primers in 9mm will not do you any good, and likely cause no harm, and you will likely not notice a difference.
I have worked up 9mm to the threshold of case failure, and that takes an extra 4.5 to 6 grains of powder.
If I work up with a magnum primer, the threshold of failure is ~ .7 gr less.
The magnum primer raises the pressure like .7 gr of powder, but does not raise the velocity like .7 gr.
The threshold of intolerable recoil is 2 to 4 extra grains of powder.
The practical limit of 9mm is the recoil, not the pressure.
The magnum primers have a thicker cup, and take a little harder strike to set off, but most any 9mm is up to it.
What does it all mean?
Using magnum primers in 9mm will not do you any good, and likely cause no harm, and you will likely not notice a difference.