Maybe "can't" is the wrong word, but on DoubleTap Defense's web page they have written
Important: Use the brand of the two fired cases included with your gun first. - For 45 ACP it is 230 grain FMJ standard velocity - For 9mm it is 115 grain FMJ standard velocity The two test fired cases included in your gun were chosen for these reasons. They are usually Remington or Federal .
I thought, being a derringer, it would be able to fire all sorts of cartridges that wouldn't work in a semi-auto, but instead it seems like the most ammo-restrictive firearm in recent production. I can understand not recommending +P ammo, but they're not only specifying bullet weight but they're specifying Remington or Federal and FMJ !
http://www.doubletapdefense.com/
They also have this warning:
- DO NOT USE any brand of so called “low recoil’ type ammunition. -
Does anyone know why low recoil ammunition (like Hornday Lite ?) is causing problems in the Double Tap ?
Important: Use the brand of the two fired cases included with your gun first. - For 45 ACP it is 230 grain FMJ standard velocity - For 9mm it is 115 grain FMJ standard velocity The two test fired cases included in your gun were chosen for these reasons. They are usually Remington or Federal .
I thought, being a derringer, it would be able to fire all sorts of cartridges that wouldn't work in a semi-auto, but instead it seems like the most ammo-restrictive firearm in recent production. I can understand not recommending +P ammo, but they're not only specifying bullet weight but they're specifying Remington or Federal and FMJ !
http://www.doubletapdefense.com/
They also have this warning:
- DO NOT USE any brand of so called “low recoil’ type ammunition. -
Does anyone know why low recoil ammunition (like Hornday Lite ?) is causing problems in the Double Tap ?