taper crimp die

skizzums · April 19, 2014, 10:17 PM

hey guys, been loading 9mm for a good bit, i have never used a taper crimp because i didnt buy the deluxe set wit my lee press. i would like to play around with one, after simply searching 9mm taper crimp die, i get a hornaday, lee, lyman all between 20 and 24 bucks. any difference between the crimp that these leave? any better than other, or do tey all do the same thing wth maybe just a difference in the quality of the die itself

Don P · April 20, 2014, 09:06 AM

9 mm dies will be a taper crimp. That is what all die makers will have. You can buy taper crimp dies for revolver cartridges. Semi-autos are a taper crimp and revolvers are a roll crimp as a general rule.

pete2 · April 20, 2014, 09:40 AM

A taper crimp is a taper crimp however, taper crimping while seating the bullet may cause problems, I did it for a while but I got deformed noses on by bullets. I found it best to crimp after seating the bullet on both 45 and 9MM.

JT-AR-MG42 · April 20, 2014, 10:49 AM

Pete is correct. Best to always seat and taper crimp as two steps.
I also do my roll crimping separate as well.

I use Lyman dies and their taper crimp dies exclusively except in the .41 Magnum loadings for a D.E.
For those loads I use a Redding taper crimp profile die for the crimp. It is an excellent die as well and am pleased with the chronographed consistency of the loads produced.

JT

skizzums · April 20, 2014, 11:13 AM

okay, thank you

was really just asing if one makers crimp would be better or more consistent over the other, but if a crimp is a crimp, ill just stick with lee

THANKS!!!!

skizzums · April 20, 2014, 01:38 PM

i just noticed this was in competition shooting instead of reloading, sorry bout that

James K · April 20, 2014, 07:12 PM

When a case is supported against the firing pin blow (headspaced, if you prefer) on the case mouth, as with the 9mm Luger and the .45 ACP, a roll crimp can lead to soft support and erratic ignition, which in turn leads to inaccuracy. That is why a taper crimp is preferable for such calibers, since it allows proper support on the case mouth.

Jim

k4swb · April 21, 2014, 03:23 PM

Remove the seater stem from the seater/crimp die and just use the Lee die for crimping.

Now spend a little more and get a GOOD seater die from someone that knows how to make a seater die. Lee does not.

April 19, 2014, 10:17 PM	#1
skizzums Senior Member Join Date: July 1, 2013 Location: Douglasville, Ga Posts: 4,615	taper crimp die hey guys, been loading 9mm for a good bit, i have never used a taper crimp because i didnt buy the deluxe set wit my lee press. i would like to play around with one, after simply searching 9mm taper crimp die, i get a hornaday, lee, lyman all between 20 and 24 bucks. any difference between the crimp that these leave? any better than other, or do tey all do the same thing wth maybe just a difference in the quality of the die itself __________________ My head is bloody, but unbowed

April 20, 2014, 09:06 AM	#2
Don P Senior Member Join Date: December 17, 2005 Location: Swamp dweller Posts: 6,187	9 mm dies will be a taper crimp. That is what all die makers will have. You can buy taper crimp dies for revolver cartridges. Semi-autos are a taper crimp and revolvers are a roll crimp as a general rule. __________________ *NRA Life Member, NRA Chief Range Safety Officer, NRA Certified Pistol Instructor,, USPSA & Steel Challange NROI Range Officer, ICORE Range Officer, ,MAG 40 Graduate* *As you are, I once was, As I am, You will be.*

April 20, 2014, 11:13 AM	#5
skizzums Senior Member Join Date: July 1, 2013 Location: Douglasville, Ga Posts: 4,615	okay, thank you was really just asing if one makers crimp would be better or more consistent over the other, but if a crimp is a crimp, ill just stick with lee THANKS!!!! __________________ My head is bloody, but unbowed Last edited by skizzums; April 20, 2014 at 11:27 AM. Reason: speeling/typoos

April 20, 2014, 01:38 PM	#6
skizzums Senior Member Join Date: July 1, 2013 Location: Douglasville, Ga Posts: 4,615	i just noticed this was in competition shooting instead of reloading, sorry bout that __________________ My head is bloody, but unbowed

April 21, 2014, 03:23 PM	#8
k4swb Senior Member Join Date: July 11, 2009 Posts: 389	Remove the seater stem from the seater/crimp die and just use the Lee die for crimping. Now spend a little more and get a GOOD seater die from someone that knows how to make a seater die. Lee does not. __________________ My posts are things I have tried or experienced. You may or may not wish to emulate them so read them with this in mind. Compromise means that both sides give something, but they never give, they just take. I'm The NRA!

April 20, 2014, 09:40 AM	#3
pete2 Senior Member Join Date: May 15, 2012 Location: Texas Posts: 2,566	A taper crimp is a taper crimp however, taper crimping while seating the bullet may cause problems, I did it for a while but I got deformed noses on by bullets. I found it best to crimp after seating the bullet on both 45 and 9MM.

April 20, 2014, 10:49 AM	#4
JT-AR-MG42 Senior Member Join Date: December 27, 2008 Posts: 555	Pete is correct. Best to always seat and taper crimp as two steps. I also do my roll crimping separate as well. I use Lyman dies and their taper crimp dies exclusively except in the .41 Magnum loadings for a D.E. For those loads I use a Redding taper crimp profile die for the crimp. It is an excellent die as well and am pleased with the chronographed consistency of the loads produced. JT

April 20, 2014, 07:12 PM	#7
James K Member In Memoriam Join Date: March 17, 1999 Posts: 24,383	When a case is supported against the firing pin blow (headspaced, if you prefer) on the case mouth, as with the 9mm Luger and the .45 ACP, a roll crimp can lead to soft support and erratic ignition, which in turn leads to inaccuracy. That is why a taper crimp is preferable for such calibers, since it allows proper support on the case mouth. Jim