What Kind of Crimp is Buffalo Bore Using?

Southern Shooter · March 14, 2012, 04:01 PM

Hello,
What kind of crimp is Buffalo Bore using in this picture?
http://www.gunblast.com/images/Ruger...5/DSC02529.jpg
Thanks

ScottRiqui · March 14, 2012, 09:25 PM

Interesting - it doesn't appear to be either a taper crimp or a roll crimp. It looks like the crimp I get on my .223 cases using the Lee collet crimp die (although the crimp isn't as obvious on my cases.)

Lost Sheep · March 15, 2012, 12:20 AM

What kind of crimp? Strong.

It wouldn't do to have any round jump crimp from the recoil of its brothers.

It looks to me like a REALLY overenthusiastic roll crimp that went too far down the length of the case. Like maybe the crimp die was set for a shorter piece of brass.

In Buffalo Bore's case, given their affinity for heavy-hitting loads, that's a good thing, right?

Lost Sheep

PA-Joe · March 15, 2012, 05:15 AM

Collet crimp like you get with the LEE Factory Crimp Die for revolver loads.

Southern Shooter · March 15, 2012, 07:55 AM

I found this image on-line. Is this a more "normal" example of a factory crimp?

TLC454290RF_01.jpg

Thanks

SL1 · March 16, 2012, 08:42 PM

Speer advocates this type of crimp for heavy-recoiling cartidges and manufctures its bullets for such cartridges accordingly.

It can be formed by adjusting the seating die so that the case mouth ends at the nose-end of the crimp ring. Then, the roll crimp die is adjusted so that the case side is pushed into the crimp ring for most of the width of the ring.

This was previously considered a poor example of 'over-crimping' with a roll crimp die. It only works well with a crimp ring that is flat-bottomed and sufficiently deep that the outide of the case can be reduced to bullet diameter. That is how Speer makes its bullets for the cartridges where it recommends that type of crimp.

A Lee "factory crimp" die like the ones for rifle cartridges could also make this type of crimp. But, the "factory crimp" dies Lee makes for revolver cartridges do not use a collet-type crimper, so they essentially work the same as a regular roll crimp die to make the "step-down" crimp.

SL1

March 15, 2012, 12:20 AM	#3
Lost Sheep Senior Member Join Date: January 24, 2009 Location: Anchorage Alaska Posts: 3,341	Strong What kind of crimp? Strong. It wouldn't do to have any round jump crimp from the recoil of its brothers. It looks to me like a REALLY overenthusiastic roll crimp that went too far down the length of the case. Like maybe the crimp die was set for a shorter piece of brass. In Buffalo Bore's case, given their affinity for heavy-hitting loads, that's a good thing, right? Lost Sheep

March 15, 2012, 07:55 AM	#5
Southern Shooter Senior Member Join Date: May 4, 2005 Location: central Louisiana Posts: 469	Better Example of a Factory Crimp? I found this image on-line. Is this a more "normal" example of a factory crimp? TLC454290RF_01.jpg Thanks __________________ "My plea is that we stop seeking out the storm and enjoy more fully sunlight. I am suggesting that as we go through life we accentuate the positive. I am asking that we look a little deeper for the good, that we still our voices of insult and sarcasm, that we more generously compliment and endorse virtue and effort." Gordon B. Hinckley

March 16, 2012, 08:42 PM	#6
SL1 Senior Member Join Date: November 8, 2007 Posts: 2,001	Probably a "step-down" crimp Speer advocates this type of crimp for heavy-recoiling cartidges and manufctures its bullets for such cartridges accordingly. It can be formed by adjusting the seating die so that the case mouth ends at the nose-end of the crimp ring. Then, the roll crimp die is adjusted so that the case side is pushed into the crimp ring for most of the width of the ring. This was previously considered a poor example of 'over-crimping' with a roll crimp die. It only works well with a crimp ring that is flat-bottomed and sufficiently deep that the outide of the case can be reduced to bullet diameter. That is how Speer makes its bullets for the cartridges where it recommends that type of crimp. A Lee "factory crimp" die like the ones for rifle cartridges could also make this type of crimp. But, the "factory crimp" dies Lee makes for revolver cartridges do not use a collet-type crimper, so they essentially work the same as a regular roll crimp die to make the "step-down" crimp. SL1

March 14, 2012, 09:25 PM	#2
ScottRiqui Senior Member Join Date: January 27, 2010 Location: Norfolk, VA Posts: 2,905	Interesting - it doesn't appear to be either a taper crimp or a roll crimp. It looks like the crimp I get on my .223 cases using the Lee collet crimp die (although the crimp isn't as obvious on my cases.)

March 15, 2012, 05:15 AM	#4
PA-Joe Senior Member Join Date: June 9, 2010 Location: NEPA Posts: 909	Collet crimp like you get with the LEE Factory Crimp Die for revolver loads.