|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Today's Posts | Search |
|
Thread Tools | Search this Thread |
November 12, 2015, 03:59 PM | #1 |
Senior Member
Join Date: September 10, 2015
Posts: 152
|
Roll crimp or taper crimp .45 ACP
My S&W 625-2 is chambered for .45 Auto Rim, but can also use .45 ACP with half moon or full moon clips. I purchased RCBS dies for each cartridge. The Auto Rim seating die implements a roll crimp, which I presume is standard for revolver cartridges. The ACP seating die implements a taper crimp and I also have a separate Redding taper crimp die which I recently purchased.
My questions are: 1. If I am reloading ACP rounds to use in the revolver, can I use a roll crimp? 2. If I can use a roll crimp for ACP rounds for my revolver, should I use a roll crimp? I only use light target range loads, so I presume excessive pressure is not a concern. I have only used taper crimped ACP cartridges and roll crimped Auto Rim cartridges so far. However, since I was recently able to hone my full moon clips to function reliably, I noticed that the taper crimp hangs up a little on my non-chamferred cylinder. I am only putting a light taper crimp on the ACP rounds, enough to pass the plunk test. |
November 12, 2015, 04:29 PM | #2 |
Senior Member
Join Date: January 8, 2008
Posts: 803
|
For a revolver, it really doesn't matter because you are using the half moon to keep the rounds in place during shooting. Whichever works best for you, though I pretty much adhere to the "autos get taper, revolvers get roll" with every round I load just to keep things uniform across the board.
|
November 12, 2015, 04:32 PM | #3 | ||
Senior Member
Join Date: March 21, 2013
Location: Idaho
Posts: 5,525
|
Quote:
Quote:
At least, that's how I see it. And, that's how I do it for my 38 Special ammo. I load a good amount of plated bullets, and taper crimp them. Then I have a good amount of lead bullets with a crimp groove; and I taper crimp some (light recoil), and roll crimp others (heavier recoil).
__________________
Gun control laws benefit only criminals and politicians - but then, I repeat myself. Life Member, National Rifle Association |
||
November 12, 2015, 05:15 PM | #4 |
Senior Member
Join Date: September 12, 2002
Location: Twin Cities, MN
Posts: 5,317
|
For .45 ACP taper crimp.
Even if you don't have a semi-auto, who knows, one might just captivate you and then you'll want to have non-roll crimped .45 ACP. |
November 12, 2015, 07:29 PM | #5 |
Senior Member
Join Date: December 14, 2004
Location: Northern Indiana
Posts: 6,117
|
Taper, takes away the issue of different case length. Also allows a good crimp without deforming the bullet.
__________________
It was a sad day when I discovered my universal remote control did not in fact control the universe. Did you hear about the latest study.....5 out of 6 liberals say that Russian Roulette is safe. |
November 13, 2015, 01:48 AM | #6 |
Junior member
Join Date: April 22, 2014
Location: Washington
Posts: 1,549
|
I roll crimp everything. I have no control over what gun someone will use to shoot ammo that I have loaded and I want no set back problems. Just because a cartridge headspaces on the case mouth does not mean that you can not use a roll crimp. You just have to find the balance between having enough crimp and still having proper headspace.....it aint that hard.
|
November 13, 2015, 04:13 AM | #7 |
Senior Member
Join Date: January 5, 2009
Location: Just off Route 66
Posts: 5,067
|
If your concern is that the bullet will move forward (all non-crimped revolver bullets will) then a roll crimp for revolver bullets will insure they stay in place. It will deform the bullet slightly, but do not worry the forcing cone on the revolver will take care of that. If however, you will be using the same load for a semi-auto, I would recommend that no crimp is used and that you segregate (separate) those used for revolver and semi-auto.
If you are using bullets with a cannelure then a roll crimp into the cannelure will work best in both a revolver as well as a semi-auto. Hope this helps. Jim
__________________
Si vis pacem, para bellum |
November 13, 2015, 09:24 AM | #8 |
Senior Member
Join Date: March 8, 2013
Location: Rittman, Ohio
Posts: 2,074
|
Answer is, either one is correct for a revolver. I would let the bullet being used determine what type crimp. If it has a cannelure, role crimp, if not - taper crimp.
|
November 14, 2015, 08:45 PM | #9 | |
Senior Member
Join Date: July 8, 2006
Location: Mill Creek, WA
Posts: 167
|
Quote:
__________________
gunfighter48 A 45 may not expand but it will never be smaller than .45!! NRA Benefactor Life Member |
|
November 15, 2015, 01:21 AM | #10 |
Junior member
Join Date: April 22, 2014
Location: Washington
Posts: 1,549
|
Use your calipers and measure your roll crimps. All it takes is one or two thousands of an inch of a roll crimp to hold the bullet in place with case mouthed brass.
Speer Reloading Manual 11 Page 434 Since the 45 Auto headspaces on the case mouth, only a slight taper crimp can be used. Most guns also work well when the ammunition has a slight roll crimp. Last edited by hartcreek; November 15, 2015 at 06:20 AM. |
November 15, 2015, 01:55 AM | #11 |
Member In Memoriam
Join Date: March 17, 1999
Posts: 24,383
|
You should use a taper crimp for .45 ACP. The reason is that a rolled over case mouth does not offer solid enough case support for good ignition and that can affect accuracy and even cause misfires. It is true that the case is supported by the clip, but it is too springy to offer as good support as a firm seating on the case mouth.
The .45 Auto Rim, of course, is supported by the rim and either type of crimp can be used as long as it is enough to retain the bullet against recoil. Jim |
|
|