I read that article too.The Annoyed Man wrote:Gun-Test's August issue has a comparison of the new R51 to the old prewar .380 version of it. They actually gave it an A grade. They also made it very clear that if you use anything other than the exactly 3 or 4 loads that Remington recommends for the gun, it not only won't work, but it creates very dangerous situations with case bulging, etc. Additionally, using other than the sanctioned ammo will cause the gun to jam up making it almost impossible to disassemble.
IMHO, any gun that won't safely and properly digest SAAMI specification compliant ammo from all the major manufacturers isn't ready for prime time, although I would make exceptions for some specialty niche guns like the tiny Seecamps.