Too much Crimp for 9mm?

D

D_

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Hello,

I never put a crimp on my 9mm loads before. Just loaded with new brass for match. I noticed that my fps was all over the place so I am putting a little crimp on my loads to fix this.

I am curious if there is a negative to having too much crimp on my loads. I usually load for about 132-135 pf for my SP01 if that helps with an answer.

What do you guys who shoot pd do for your loads?

Thanks,
D_
 
John Y Cannuck said:
Headspace for the 9mm is on the rim if I remember right. Be carefull.
Click to expand...



no, it's on the case mouth. Buy a taper crimp die for 19$ and problem solved. And it increases feed reliability. Roll crimping is best left to revolvers.
 
I am using Hornady dies. Couldnt I just lower the seater body die down untill i get a good crimp?

Question is how do I determine if I have a good crimp?

Is too much bad? Will too much affect fps?

Thanks,
D_
 
D_ said:
I am using Hornady dies. Couldnt I just lower the seater body die down untill i get a good crimp?

Question is how do I determine if I have a good crimp?

Is too much bad? Will too much affect fps?

Thanks,
D_
Click to expand...
1) yes
2) when the case mouth digs into the bullet a _little_ bit
3) yes, because the case rests in the chamber on the case mouth - too much crimp and it will slide too far in the chamber and maybe not go 'bang' when you pull the trigger.
 
D_ said:
Hello,

I never put a crimp on my 9mm loads before. Just loaded with new brass for match. I noticed that my fps was all over the place so I am putting a little crimp on my loads to fix this.

I am curious if there is a negative to having too much crimp on my loads. I usually load for about 132-135 pf for my SP01 if that helps with an answer.

What do you guys who shoot pd do for your loads?

Thanks,
D_
Click to expand...

Loading a 9mm to a power factor of 132-135 with the 3 most common bullets will give you these velocities on your chrony.
1147fps to 1174fps using a 115 grain bullet
1064fps to 1089 fps using a 124 grain bullet
898fps to 918fps using a 147 grain bullet
If you’re loading lead at high volumes, clean your crimp die regularly along with your height die. Over crimp loads and compressed loads is always something to watch out for.
I always double check a couple powder charge weights every 100 loads or so.
I also used a good quality carbide die sets and used a case checker to speed things up.
It takes time to find the sweet spot for the cartridges, gun and shooter that works well. I wouldn't spend too much time splitting hairs in handgun loads because most of us can't miss fast enough any how. :D
I hope this helps you out a bit.
Driller
 
I like to crimp seperate from seating, way easier to set up.
What are you loading on for a machine, Dallas? Does Hornady not have a seperate crimp die?
 
Try using Lee taper crimp dies for auto calibers. The die includes a carbide sizer which is great to make sure all the rounds chamber, especially when the fired brass has a bit of a bluge. It makes sure that all rounds will chamber without checking each round individually.
 
Hornady has a taper crimp die for all major semi auto handgun calibers and they sell for about 20$ or a bit less. As a bonus, the fit in the nice red box that the hornady dies come in, in a special slot made for them with the rest of the die set. Happily enough, once the dies are mounted in the LNL collars, the STILL fit in the box! Way to go Hornady, I didn't expect that and my storage is much simpler!
 
SandRoad said:
Try using Lee taper crimp dies for auto calibers. The die includes a carbide sizer which is great to make sure all the rounds chamber, especially when the fired brass has a bit of a bluge. It makes sure that all rounds will chamber without checking each round individually.
Click to expand...

+1 Lee Factory Crimp Die is one of the best little kept secrets of pistol reloading....not sure if it will work off a progressive loader but it works great for me when I am single stage loading.
 
Do not roll crimp 9MM or crimp into the bullet. First it is not necessary and second the 9MM like the .45acp headspaces off the mouth or it is suposed to. YOu run the risk of your cartridges not firing using anything but a taper crimp to remove the belling.

I don't have the LFCD but guys who use it swear by it. I just have found no need for it to date and have often wondered what it does to lead bullets ie sizes them down to .451 in the .45acp or .355 in the 9MM which would not be a good thing, though your cartridges would look pretty.

Take Care

Bob
 
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