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crimp or no crimp

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:14
MADMATT View Drop Down
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Is it needed to crimp a rifle case to a slug that has no crimp ring on it?

I been told by guys that have been reloading for a while that you need to crimp the case to the slug.

I read in the latest nosler reloading book that you don't need to crimp a rifle round, just seat the slug to length and your done.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:16
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what caliber are we talking? and is it semi auto??
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:18
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Your gonna finda  mixed bag of answers on this, some crimp some dont.  IF your FLS die is set up correctly you shouldnt need to but the assurance when your running semi auto is mind easing at times.Wink
 
me personally I crimp all that goes into my semi autos none for a bolt gun


Edited by SVT_Tactical - March/21/2011 at 12:18
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:20
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Originally posted by SVT_Tactical SVT_Tactical wrote:

Your gonna finda  mixed bag of answers on this, some crimp some dont.  IF your FLS die is set up correctly you shouldnt need to but the assurance when your running semi auto is mind easing at times.Wink
 
me personally I crimp all that goes into my semi autos none for a bolt gun

thats the way i would do it as well, unless your shooting a .458 lott, then maybe in a bolt action of that size i would use a roll crimp.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:23
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I don't crimp anything, not even the 458winmag, or the 500S&W
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:48
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Crimping is mainly to keep the bullets seated etc when the ammo is handled roughly during transport etc. Millitary ammo is crimped. They even crimp the primers in if there not glued or whatever that blue stuff is that held the primers in my .303 ammo was. If you dont handle your ammo harshly or have it in loose bulk etc you will be fine as long as it has been reloaded properly.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 12:48
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What type of crimp are you talking about? These are the common crimp types: roll crimp, taper crimp, and factory or collet crimp.
A roll crimp is typically used on projectiles with cannalures.
Taper crimps can be used on projetiles with and without cannalures, but if there is no cannalure the taper crimp should be just enough to snug the bullit up in the case mouth.
The taper and collet crimp are seperate operations from bullit seating, but a roll crimp can be applied during bullit seating.
If your loading for a semiauto, a crimp of some kind is recommended. If your loading for a heavy recoiling round, a crimp is probably a must. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 13:07
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I used to crimp everything, but now only crimp pistol rounds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 13:15
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I don't crimp anything either.  Not even for my ARs or my 7mm BAR.  I do taper crimp pistol rounds though so they function better.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 14:05
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it's a 25-06 bolt action.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 14:07
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Originally posted by MADMATT MADMATT wrote:

it's a 25-06 bolt action.

no reason to crimp, all your doing there is raising the pressure, and the chances of blowing your self up.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 14:11
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thanks for the  intel.
I'm glad this forum is here.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 14:12
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we are too
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 14:14
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Originally posted by pyro6999 pyro6999 wrote:

Originally posted by MADMATT MADMATT wrote:

it's a 25-06 bolt action.

no reason to crimp, all your doing there is raising the pressure, and the chances of blowing your self up.
also , if the crimp is not the same pressure everytime the bullets can do strange thing like not fly right, or fly right and not left.. Its just one more thing to do during hand loading that will not be the same everytim you do it. example. some brass might be harder than some. the pressure might be greater in the harder case than it would be in the softer ones. so it could make you have a faster FPS and at 200 yards you shoot 2 inch high by mistake ( normaly it would work) but the hard case's number was up on the shot. the PFS was up 25. so your drop was 1/2 instead of 1 to 1/4. so insteda of hitting the heart you hit the no man zone between the back bone and heart. Hope that made some since.
 
Oh don't crimp.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/21/2011 at 21:46
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Roll Crimp Cannelure, Taper Crimp Semi Pistol, Factory Crimp Auto and Semi Auto Rifle.

No crimp on the Bolt Guns.

I do not believe the Crimp will be my excuse for not hitting what I aim at, and for those that think it is that big in the equation I think not.
Hiding

Wink

Hiding


Edited by 338LAPUASLAP - March/21/2011 at 21:48
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 06:56
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Originally posted by 338LAPUASLAP 338LAPUASLAP wrote:

Roll Crimp Cannelure, Taper Crimp Semi Pistol, Factory Crimp Auto and Semi Auto Rifle.

No crimp on the Bolt Guns.

I do not believe the Crimp will be my excuse for not hitting what I aim at, and for those that think it is that big in the equation I think not.
Hiding

Wink

Hiding
 
Oh! but at certain load points it is.
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 07:27
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As mentioned, crimping is really only necessary for ammo that will be handled roughly. And, as mentioned, it will introduce another step, possibly decreasing accuracy - although I have never noticed much difference in my semi-auto M1 using surplus .30-06 HXP. It shoots the same from box to box, even lot to lot. I'd just avoid doing it out of laziness.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 12:08
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so a crimp is recomended for a semi-auto but not a bolt action?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 12:33
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Originally posted by MADMATT MADMATT wrote:

so a crimp is recomended for a semi-auto but not a bolt action?

yes.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 12:35
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by some.  Wink
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/22/2011 at 12:44
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unless your taking off to africa, to chase animals that can stomp or eat you, i wouldnt worry about crimping any bolt action rifle. lever, and semi autos play by different rules imo. semi autos have a different type of recoil due to their gas operating systems, and lever guns ( except browning blr's) have ammo tubes to hold the ammo. the recoil is the only reason i can think of that makes me want to crimp any thing.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/26/2011 at 17:10
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Lee Precision claims that using their 'factory crimp' die increases accuracy.
I've never tested that claim, but do happen to have a Lee factory crimp die for one of my rifles and will test some loads with/without crimp next time I make it to the range and report back.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/27/2011 at 00:02
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Originally posted by Alan Robertson Alan Robertson wrote:

Lee Precision claims that using their 'factory crimp' die increases accuracy.
I've never tested that claim, but do happen to have a Lee factory crimp die for one of my rifles and will test some loads with/without crimp next time I make it to the range and report back.


Just remember to back your load down a bit on the rounds that you crimp   Thunbs Up
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/29/2011 at 02:56
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"Just remember to back your load down a bit on the rounds that you crimp"   Thunbs Up
 
Unless,  maybe & perhaps your going to be hunting in very cold weather.
 
Also if you take up loading certain powders 'full house' for magnum type handgun cartidges.
 
For the most part crimping is probably not necessary, but thier are instances when it is useful , if not necessary. Revolvers, tube magazines, perhaps when loading lubed cast bullets reliabilaty would be enhanced with crimping. 
Keep asking questions, study the subject , gain some expierience, and you'll come to a point when you'll know if you want to crimp a given loading .
Remember, crimping was developed for a reason. You don't want to be in the  position of having to make a money shot, and 'come a crupper' because of an archaic ammo malf. 
 
HM
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/29/2011 at 11:15
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I have some of the lee crimp dies in several calibers.  For most loads I do not think a crimp is needed, if you use one at all  -- err on the side of a light crimp not one that deforms the bullet which can be done with these things. With pistols the seating die properly set does crimp lightly and is probably a good idea for heavy caliber revolvers.  If I crimp anything it is a light crimp on ammo for a semi auto rifles. The blue stuff around the primer should be primer sealer and for long term storage and water resistance it is a good thing.
 
I do not crimp my 300 WSM bolt gun cartridges and for a 25-06 I would not crimp those either.  
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