April 21st, 2013, 12:55 PM
Join Date: Nov 2012
Location: SW Florida
This from Midways customer review section:
"I have started using these primers for nearly everything I load. This includes everything from 9mm to my .357 Magnum Cartridges. I was concerned about a warning on the 1-1/2 Type Primers not being recommended for .40 S&W. After speaking directly to Remington regarding the warning, I learned that the only difference between these Primers and the 1-1/2 type is the thickness of the sheet metal used in the manufacture of the primer cup. Remington stated there is no difference in the priming compound between the two different primers, and these can be used on nearly every cartridge, low or high pressure.If you do have questions, I do strongly encourage folks to speak with Remington directly as I did.Good Luck and Happy Shooting!"
I would check with Remington yourself and see what they say. In any event you will not have trouble selling those primers if you decide to get rid of them.