How much crimp? Lee FCD guidance sought. - Page 6

**Walkalong** · September 8, 2012, 11:42 AM

A crimp on a pulled Argentine 147 Gr FMJ-BT bullet. They have a built in tapered crimp groove. The roll crimp edge pushed the case mouth into the groove quite nicely. I used an insert I machined for a Hornady seater.

147 Gr FMJ-BT in .300 Blackout.

Daves21lax · October 23, 2012, 04:33 AM

This is really a great thread! I am new to reloading and have owned a Hornady LNL press for 6+ months. To this day, I still haven't produced any rounds due to me second guessing my taper crimps on .45 acp rounds. Does anyone have any tips to test a crimp for sufficient setback? Thanks for the help guys, and I hope soon I'll be able to contribute too!

**Walkalong** · October 23, 2012, 07:44 AM

Neck tension holds the bullet in straight walled auto calibers. No amount of "crimp" can fix it if there is not enough neck tension. Test rounds for setback before "crimping". The crimp should remove the bell, or perhaps .001 more. Any more than that can be detrimental. I adjusted my .45 ACP crimp die so that the shortest cases get the bell removed and the longest cases get a hair more.

bosn1 · November 30, 2012, 08:40 PM

There's a great, comprehensive article on crimping in the Dec 2012 issue of "Handloader".

**Walkalong** · December 30, 2012, 01:18 PM

A Medium to Heavy Modified Roll Crimp. I used an RCBS "Taper Crimp" seater with no seater stem. The crimp ledge is not nearly as sharp an angle as the common roll crimp die of old, and is not anywhere close to as small an angle as a true taper crimp die, but is around 45ish degrees. It is about the same as the crimp ledge Hornady is putting in the sleeves for their seaters. This new angle seems to be the new "thing". I wanted to crimp to help with bullet setback if the bullet banged on something on the way to the chamber.

.300 BLK with a Speer 130 Gr Hot Core JSFP

**Walkalong** · December 30, 2012, 01:21 PM

A Medium to Heavy Modified Roll Crimp. I used the same RCBS "Taper Crimp" seater with no seater stem as I used for the Speer 130 Gr above.

.300 BLK with a Hornady 123 Gr Z-Max (.310)

stavman11 · April 26, 2013, 04:51 PM

Great thread...

Thanks all....

I have tested a few Rounds and had some Bullet Movements... so Back at the crimp Process again...

Thanks again THR... always some GREAt info to be found

October 23, 2012, 07:44 AM	#128
Walkalong Moderator Join Date: November 20, 2006 Location: Alabama Posts: 29,726	Neck tension holds the bullet in straight walled auto calibers. No amount of "crimp" can fix it if there is not enough neck tension. Test rounds for setback before "crimping". The crimp should remove the bell, or perhaps .001 more. Any more than that can be detrimental. I adjusted my .45 ACP crimp die so that the shortest cases get the bell removed and the longest cases get a hair more. __________________ Do you ever wonder why nobody ever robs the bag man for the mob? No, you don't. "Oh bother" said Pooh, as he chambered another round. Author unknown.

November 30, 2012, 08:40 PM	#129
bosn1 Member Join Date: May 7, 2012 Location: Ventura, CA Posts: 1	Crimping There's a great, comprehensive article on crimping in the Dec 2012 issue of "Handloader".

October 23, 2012, 04:33 AM	#127
Daves21lax Member Join Date: April 5, 2011 Posts: 1	This is really a great thread! I am new to reloading and have owned a Hornady LNL press for 6+ months. To this day, I still haven't produced any rounds due to me second guessing my taper crimps on .45 acp rounds. Does anyone have any tips to test a crimp for sufficient setback? Thanks for the help guys, and I hope soon I'll be able to contribute too!

April 26, 2013, 04:51 PM	#132
stavman11 Member Join Date: June 11, 2012 Posts: 68	Great thread... Thanks all.... I have tested a few Rounds and had some Bullet Movements... so Back at the crimp Process again... Thanks again THR... always some GREAt info to be found