Roll Crimp, Or Not ?

TOPKICK · October 15, 1999, 01:26 AM

I currenty load .45ACP with 200gr SWC cast bullets.(my own) 4.9 gr of W231. I've been roll crimping almost from the beginning almost 5 yrs. ago. Without it, sometimes I would expierience feeding problems. A friend suggested roll crimps might help. It did. Now my old 1911 seems to be getting looser and looser. Do I have a pressure problem here?

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Proud,dues paying,member of the "Vast Right Wing Conspiracy"

10mmrules · October 15, 1999, 11:55 AM

All autos should have a taper crimp. If you are using the dillon dies you already are using the taper crimp. I suggest the Lee factory crimp die. It sizes again as it tapercrimps, so if you should compress your brass as you are seating the bullet, it will be correctly sized. I know I feel much better shooting my reloads using this die. BTW it only cost's $12.47 from midway, what do you have to loose, but headches?

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10MM Magnum.... tried the rest, now I got the best

BenDover · October 15, 1999, 03:37 PM

I've read that roll crimp is not needee and not recommended. RCBS and a few others do not make roll crimp for 45ACP. Go to bulleye.com and ask the experts....hope it helps you. Steve

preacher · October 17, 1999, 05:24 PM

It's been awhile since I thought about this type of question but You definitely do not want to roll crimp a semiauto case. It can cause headspace problems because a semiauto usually headspaces on the case mouth, whereas a revolver cartridge headspaces on the case rim. In answer to the possible pressure problem, I would suspect there is. A roll crimp bites into the side of the bullet, holding it in place for a longer duration and raising peak pressure.
When you taper crimp, the die firmly squeezes the case neck around the bullet and not into it. It can also affect accuracy. I agree with "10mmrules" and get that taper crimp die. Your cases will last longer and best of all your gun will last longer.

[This message has been edited by preacher (edited October 17, 1999).]

October 15, 1999, 01:26 AM	#1
TOPKICK Member Join Date: October 11, 1999 Location: Indiana Posts: 61	I currenty load .45ACP with 200gr SWC cast bullets.(my own) 4.9 gr of W231. I've been roll crimping almost from the beginning almost 5 yrs. ago. Without it, sometimes I would expierience feeding problems. A friend suggested roll crimps might help. It did. Now my old 1911 seems to be getting looser and looser. Do I have a pressure problem here? ------------------ Proud,dues paying,member of the "Vast Right Wing Conspiracy"

October 15, 1999, 11:55 AM	#2
10mmrules Senior Member Join Date: July 30, 1999 Posts: 140	All autos should have a taper crimp. If you are using the dillon dies you already are using the taper crimp. I suggest the Lee factory crimp die. It sizes again as it tapercrimps, so if you should compress your brass as you are seating the bullet, it will be correctly sized. I know I feel much better shooting my reloads using this die. BTW it only cost's $12.47 from midway, what do you have to loose, but headches? ------------------ 10MM Magnum.... tried the rest, now I got the best

October 15, 1999, 03:37 PM	#3
BenDover Member Join Date: October 15, 1999 Location: San Diego, CA. USA Posts: 51	I've read that roll crimp is not needee and not recommended. RCBS and a few others do not make roll crimp for 45ACP. Go to bulleye.com and ask the experts....hope it helps you. Steve

October 17, 1999, 05:24 PM	#4
preacher Member Join Date: October 16, 1999 Location: Toccoa, Georgia, USA Posts: 36	It's been awhile since I thought about this type of question but You definitely do not want to roll crimp a semiauto case. It can cause headspace problems because a semiauto usually headspaces on the case mouth, whereas a revolver cartridge headspaces on the case rim. In answer to the possible pressure problem, I would suspect there is. A roll crimp bites into the side of the bullet, holding it in place for a longer duration and raising peak pressure. When you taper crimp, the die firmly squeezes the case neck around the bullet and not into it. It can also affect accuracy. I agree with "10mmrules" and get that taper crimp die. Your cases will last longer and best of all your gun will last longer. [This message has been edited by preacher (edited October 17, 1999).]