[3leggeddog]

I’ve never used Remington primers before, I didn’t know “5 1/2 Small Pistol “ was a M AG primer.
It doesn’t say MAG Primer on the box. So I prime up 100 9MM cases , no power yet before I found out. Can I still use them IF I back off on my power weight by a few 10th ??? will use with a 3.5 in barrel + w231 power...Thanks

[Walkalong]

It will be fine if you stop short of max by a little bit. Stopping .2 to .3 short should be plenty with W-231.

[3leggeddog]

Thanks for your reply! :)

[GLOOB]

If you read the box on the 1 1/2's, they specifically state not to use them in high pressure cartridges like 40SW and 357; you're supposed to use the 5 1/2's, instead. Since 9mm is loaded at the same or higher pressure as 40SW, I'd say you got the right primers.

[FROGO207]

Agreed with the above but any component substitutions require at the least a minimal workup for safety sake. Part of the reason I like to use CCI primers most often.:)