Sometimes the modification of cartridges can lead to evolutionary improvements. Here's the story behind the development of the .450 SMC, one of the most-potent .45-caliber handgun cartridges on the market.
The DTA is probably Double Tap Ammo - DTA and 450SMC is a small fifle primer brass is a stronger brass over the 45 super but other wise very interchangable . 450smc brass can be made from 308 win family or brass . I have shot some underwood 45 super in a couple 5" steel tight well supported chamber 1911's with heavier 23lb recoil springs and 23lb main spring and a xd 45 . Good semiauto handgun dangerous game defensive cartridge .