This bullet requires a seating depth minimum OAL of about 1.15? to chamber reliably in most handguns when loading 9mm. Most reloading manuals will specify a 1.13? for a flat nose 147 and we’ve found that it works well in our guns. However, there are some handguns that have a very short leade that will not allow for the bullet to be seated that long. Glock Gen 5’s and CZ pistols are known for their short leades and this bullet may not work for them. There are no issues with loading these for all other Glock models. If you are one of the CZ or Glock Gen 5 owners who has one of these please feel free to contact the manufacturer and chew them out for making their barrels so difficult.