Why I Crimp

ButterBean

Well-Known Member
LRH Team Member
Joined
Feb 5, 2012
Messages
4,859
Location
West Terre Haute Indiana
Somewhere in between. Since there is virtually zero bearing surface/shank seat your bullet so that the case mouth is part way up the PDR groove. Then use the crimp feature to fold the case mouth into the groove. Would work the same way using the crimp feature built into your seating die.
I already answered that question
 

nicholasjohn

Well-Known Member
Joined
Feb 12, 2019
Messages
830
Location
Vancouver, WA
Thanks, Gents. If I use the relief grooves just like I would a cannelure, I ought to be right in there. I wanted to be sure before I go spinning my wheels and wasting a bunch of these jewels.
 

ButterBean

Well-Known Member
LRH Team Member
Joined
Feb 5, 2012
Messages
4,859
Location
West Terre Haute Indiana
Thanks, Gents. If I use the relief grooves just like I would a cannelure, I ought to be right in there. I wanted to be sure before I go spinning my wheels and wasting a bunch of these jewels.
XUdbvLtQqhbifkubZi0j.jpg
sCzoBrLQuShoGaJgMBsX.jpg
 

nicholasjohn

Well-Known Member
Joined
Feb 12, 2019
Messages
830
Location
Vancouver, WA
3-4 is the norm for me.

Thanks. My plan is to first find my max load, and then start looking for best accuracy in whatever I node find while running that process. I'll test with no crimp first, and then work my way into more and more crimp in the manner you outlined in a prior post, until I find what the rifle likes best for crimp.
 

antelopedundee

Well-Known Member
LRH Sponsor
Joined
Oct 14, 2018
Messages
1,251
Location
Iowa
I guess I'll forget about trying to put any crimp on any of my 6.5-06AI ammo with the 123 grain Absolute hammers. Firstly if it would even work it's not worth the time and cost that it would probably take to get a FCD from Lee assuming they'd even do it. Secondly, the cases are too short. It's pretty well known that fire forming 6.5-06AI cases from .25-06, .270 Win etc. brass gives cases that are .012 - .015 shorter than the 2.494 nominal length for an 06 case. Also the cases almost never grow with subsequent firings. FTHOI, I tried putting on the maximum crimp that one could get from a Redding seat die. See picture. There does seem to be a slight bit of case mouth roll so if nothing else it should facilitate chambering a live round. So I guess I'll save my crimping endeavors for the ol 6.5-06.

Shaving .012 off of the bottom of the die isn't a particularly desirable option.

AaJHeHX.jpg



ekaLbkq.jpg
 
Last edited:

RockyMtnMT

Official LRH Sponsor
Joined
Mar 25, 2007
Messages
6,068
Location
Montana
Where should the crimp be applied relative to the ridges on the bearing surface of the bullet - on top of the parabolic curve, down in the bottom of the valley between them, or somewhere in between ?
We will usually ignore the PDR but some times the crimp will move your oal if you are not in between them. On the shoulder will work too.
 

Tac-O

Well-Known Member
Joined
Apr 28, 2019
Messages
929
Location
Utah
I was just reminded this thread exists from another thread that popped up! It's awesome there's so many people giving the FCD the cred it deserves!

Anyway, I have a problem... Maybe.

So with my Lee FL die that I had always used for my '06, I left the expander in. I have always used the FCD on everything. With that die, I'd always get bullet run-out of no more than 0.002". Usually 0.001-0.0015". The Lee FCD would would always either correct run-out slightly or make no change after crimping.

With a new barrel I have, I've got a standard FL Redding die. I took the expander ball out and use a Lyman M neck expander die to expand. This die has a step up in diameter on the mandrel at the top of the press stroke so that it will flare the case mouth slightly. I thought, ok I'll set it up to use that function for easier seating.

Well... The bullet runout I get with this die prior to crimping is very poor. Sometimes up to 0.004-0.005. but, sometimes almost none. When crimping with the FCD, it sometimes makes the run out worse! Case neck run-out after sizing is always almost zero. I experienced this same issue when I tried to use the Lee collet neck die on my '06. It leaves the mouth of the case unsized and so it flares it a bit.

So could it be that the flared mouth is giving me higher run-out?
 

ButterBean

Well-Known Member
LRH Team Member
Joined
Feb 5, 2012
Messages
4,859
Location
West Terre Haute Indiana
I was just reminded this thread exists from another thread that popped up! It's awesome there's so many people giving the FCD the cred it deserves!

Anyway, I have a problem... Maybe.

So with my Lee FL die that I had always used for my '06, I left the expander in. I have always used the FCD on everything. With that die, I'd always get bullet run-out of no more than 0.002". Usually 0.001-0.0015". The Lee FCD would would always either correct run-out slightly or make no change after crimping.

With a new barrel I have, I've got a standard FL Redding die. I took the expander ball out and use a Lyman M neck expander die to expand. This die has a step up in diameter on the mandrel at the top of the press stroke so that it will flare the case mouth slightly. I thought, ok I'll set it up to use that function for easier seating.

Well... The bullet runout I get with this die prior to crimping is very poor. Sometimes up to 0.004-0.005. but, sometimes almost none. When crimping with the FCD, it sometimes makes the run out worse! Case neck run-out after sizing is always almost zero. I experienced this same issue when I tried to use the Lee collet neck die on my '06. It leaves the mouth of the case unsized and so it flares it a bit.

So could it be that the flared mouth is giving me higher run-out?
Just guessing I would say yes
 

HunterMann

Well-Known Member
LRH Team Member
Joined
Jan 18, 2021
Messages
91
Location
United States of America
I know a paper shooter at the club who drove his 40x and 1200 rounds of handloads to Nebraska on a prairie dog shoot. Upon arrival, he discovered a bunch of his bullets had settled down into the case and were resting on the powder charge. He was able to recover most of them and the trip was a success. His reloads were stored in ammo boxes with the case head down. Obviously the vibrations of the thousand mile road trip, loosened up the ones with inadequate neck tension.
 

Orange Dust

Well-Known Member
Joined
Oct 23, 2015
Messages
2,382
Location
Mingo Swamp
I guess I'll forget about trying to put any crimp on any of my 6.5-06AI ammo with the 123 grain Absolute hammers. Firstly if it would even work it's not worth the time and cost that it would probably take to get a FCD from Lee assuming they'd even do it. Secondly, the cases are too short. It's pretty well known that fire forming 6.5-06AI cases from .25-06, .270 Win etc. brass gives cases that are .012 - .015 shorter than the 2.494 nominal length for an 06 case. Also the cases almost never grow with subsequent firings. FTHOI, I tried putting on the maximum crimp that one could get from a Redding seat die. See picture. There does seem to be a slight bit of case mouth roll so if nothing else it should facilitate chambering a live round. So I guess I'll save my crimping endeavors for the ol 6.5-06.

Shaving .012 off of the bottom of the die isn't a particularly desirable option.

AaJHeHX.jpg



ekaLbkq.jpg
Call Lee. They will ask you to send two fired cases, and they will make you a custom factory crimp die. I had them make me one for my .22 Nosler. took a couple of weeks and was ridiculously cheap.
 

Recent Posts

Top