The reason for crimping a rimless cartridge is to remove any flare from the mouth after seating the bullet. A rimless cartridge like the .45 ACP headspaces on the mouth of the case, so you don't want to crimp too far, just remove the flare.
My SIG 220 has a pretty generous chamber, so it's not fussy. I don't know about the FNP, how tight it's chamber is. I do have some guns that have tighter chambers, and they won't accept a cartridge that has any flare left. So I do have to slightly taper crimp for this ammunition to be reliable in my autos. Most autoloader bullet styles do not have a crimping groove, so you won't easily over do a crimp, because the bullet supports the mouth, and you'd probably crush the cartridge before you'd get much crimp from the die. I often check that my rounds will chamber smoothly on one of my tighter chambers, just to make sure I have run them far enough into the crimping die. Just don't put a roll crimp on them like a revolver cartridge.
My SIG 220 has a pretty generous chamber, so it's not fussy. I don't know about the FNP, how tight it's chamber is. I do have some guns that have tighter chambers, and they won't accept a cartridge that has any flare left. So I do have to slightly taper crimp for this ammunition to be reliable in my autos. Most autoloader bullet styles do not have a crimping groove, so you won't easily over do a crimp, because the bullet supports the mouth, and you'd probably crush the cartridge before you'd get much crimp from the die. I often check that my rounds will chamber smoothly on one of my tighter chambers, just to make sure I have run them far enough into the crimping die. Just don't put a roll crimp on them like a revolver cartridge.