As originally designed, the UMP is chambered for larger cartridges (.45 ACP and .40 S&W) than other submachine guns like the MP5 to provide more stopping power against unarmoured targets (with slightly lower effectiveness at longer ranges) than the MP5 (largely offered in 9×19mm, albeit with short-lived production of 10mm Auto and .40 S&W variants). A larger cartridge produces more recoil, and makes it harder to control in fully automatic firing. To mitigate excessive recoil, Heckler & Koch designed the UMP to have a cyclic rate of fire of around 600 (±100) rounds per minute. It is worth mentioning that the rate of fire increases if (+ P) ammunition is used.