9mm roll crimp?

[film495]

well, I really wanted the Hornady seater die, cause I like the one I got for .223, so - I'll have this Hornady set and an RCBS set for 9mm should be in a week or so and can mess with some dummy rounds. I'm sure I'll mess with the crimps and will try to get some pictures. I owe a bunch of pics for other threads, so - I'll have to go back and update when I get a good round of pics.

I do have in mind that at some point, I might want a 9mm revolver, so - a taper crimp might play into that nicely - although, I admit - stumbled onto this Hornady set by accident and didn't even know roll crimping 9mm was an option anyone sold dies for until after I ordered these a bit hastily, just cuase they were available.

 

[eb in oregon]

I do have in mind that at some point, I might want a 9mm revolver, so - a taper crimp might play into that nicely - although, I admit - stumbled onto this Hornady set by accident and didn't even know roll crimping 9mm was an option anyone sold dies for until after I ordered these a bit hastily, just cuase they were available.

Keep in mind that the crimp on any cartridge is only there to keep the bullet in place and not let it move during handling, loading, functioning, and firing. Including the recoil phase of firing. That's where bullets generally move, and it can happen in a pistol's magazine as well as in a revolvers cylinder. If your 9mm loads survive being fed into a semi-automatic pistol and firing there really is no need to crimp them further. Then too the 9mm isn't known for having heavy recoil, even in a small framed revolver.

I've 22 different sets of dies right now, most of them don't come with any other crimp than a roll crimp, unless a separate die. And too seating the bullet and crimping should be separate operations. When trying to seat and crimp at the same time I've always had troubles.

 

[Varminterror]

Folks are often surprised to learn most pistol cartridges were originally specified with roll crimp, and subsequently, most dies on the market are actually rollers. Of course, they can (and do) apply a taper crimp if not screwed in to contact the roll ledge. Unless otherwise marked specifically as taper crimp, most “standard” 9mm dies do apply roll crimp.

• Lee Seating/Crimping die (also in 3 and 4 die sets) = Roll
• Lee Factory Crimp Die (also included in 4 die sets) = Taper
• RCBS Standard Seating/crimping in 3 die sets = Roll (discontinued and replaced by a taper crimp)
• RCBS Taper Crimp in Taper Crimp 3 die sets = Taper
• Hornady Custom Grade 3 die set = Roll
• Hornady Custom Grade Taper Crimp = Taper
• Hornady American Set = Taper
• Lyman M seater dies = Roll
• Lyman crimp only M die = Taper
• All Dillon Auto Pistol Dies = Taper

Unfortunately for me, and for society as a whole, some folks refuse to believe facts which contradict their presumptions, so this list has created considerable tension elsewhere when I have shared it. But read for yourself these manufacturers’ product pages and contact their tech service lines.