Shooters Forum banner

handgun caliber

  1. Wildcat Cartridges
    Hi, I'm looking into making a high velocity small caliber .40 S&W by necking it down. The inspiration came from the .357 SIG. I was thinking about necking it down to 7mm (.277 caliber) or anywhere from 6 to 6.5mm. Is this possible to do with the .40 S&W case or are the pressures too high...