too much crimp ?

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too much crimp ?

Post by rebs on 12/23/2016, 5:51 pm

Am I using too much crinp ? The load is 38 cal, 158 gr tcbb lead, 3.0, 3.3 and 3.5 gr of WST. I am seating to the crimp groove with a fairly decent amount of crimp. My groups with all three loads is 4 to 5" at 50 feet in door range. I am shooting these loads out of a model 19 357 mag 4" barrel. Do you think I am crimping too much or should I be using 357 mag cases ?

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Re: too much crimp ?

Post by Virgil Kane on 12/23/2016, 6:03 pm

You don't say what your crimp is.  When I reload either RN or SWC I seat bullet to the front driving band, not the crimp groove, and crimp to .372. I found this gives me the best accuracy with light loads and 38 Special cases in all my 38's and 357's. YMMV


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Re: too much crimp ?

Post by 243winxb on 12/24/2016, 10:25 am

Are you using a Lee Factory crimp die?   Sizing the bullets smaller, while loaded in the case?
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Re: too much crimp ?

Post by noylj on 12/24/2016, 11:13 am

Get a Redding Profile Crimp die for ALL roll crimp applications.
As the load goes up, the crimp needs to increase. Your load may need no more than taper crimp or, depending on level, a really good roll crimp in the crimp groove.
Pictures?

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Re: too much crimp ?

Post by rebs on 12/24/2016, 1:16 pm

I am using an RCBS carbide die set. I think I may have been crimping too much. I am load 3.0 and 3.3 of WST, am I right in thinking that load doesn't need a real heavy crimp. I will try to put up some pics if I can figure out how to do it.
ON Penn's weebsite there is a pic of the 158 gr tcbb bullet, maybe someone could look and advise me where I should be crimping on the bullet ?
Here is a link to the bullet I am loadin, it is the softer cowboy action

http://www.pennbullets.com/38/38-caliber.html

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Re: too much crimp ?

Post by jmdavis on 12/24/2016, 1:25 pm

Have you measured your crimp? If not do so. And do it at least three times taking the average. No one can tell you something is too much or too little until they know what the something is.
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Re: too much crimp ?

Post by rebs on 12/24/2016, 1:29 pm

I just measured some and the crimp is between 0.375 and 0.376 average in the crimp groove of the bullet I left a link to

http://www.pennbullets.com/38/38-caliber.html

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Re: too much crimp ?

Post by LenV on 12/24/2016, 1:48 pm

My crimp. The Round nose are the most accurate out of my wheel guns (DR Legal rounds) But I have a lot of SWC bullets so I tried a little hotter load to see if I could get better groups. That's a bunch of bullets I need to just shoot up. Smile
 
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Re: too much crimp ?

Post by Wobbley on 12/24/2016, 2:00 pm

Sounds like it may be too little crimp if anything.  Look at the round in this image https://goo.gl/images/bFyT8h. Your case mouth should be rolled or skived looking like this one.  You should seat to the crimp groove for your initial tests as in a long chamber like a revolver there isn't much to be gained about seating depth unless you need powder volume.  Hodgdon lists 3.7 as max for WST.
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Re: too much crimp ?

Post by rebs on 12/24/2016, 2:28 pm

Wobbley wrote:Sounds like it may be too little crimp if anything.  Look at the round in this image https://goo.gl/images/bFyT8h. Your case mouth should be rolled or skived looking like this one.  You should seat to the crimp groove for your initial tests as in a long chamber like a revolver there isn't much to be gained about seating depth unless you need powder volume.  Hodgdon lists 3.7 as max for WST.

Do you have a measurement for your crimp ?

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Re: too much crimp ?

Post by Virgil Kane on 12/24/2016, 3:04 pm

With Remington brass and my FL size die the un-crimped brass is .375 and I crimp to .372.  Dependent on your brass it sounds like you have no crimp.

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Re: too much crimp ?

Post by rebs on 12/24/2016, 3:38 pm

I am using all Federal brass. I measured a few more and found them to be 0.378 and 0.379

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Re: too much crimp ?

Post by rebs on 12/29/2016, 12:04 pm

I increased the crimp to .374 and it made quite a difference in group size.  I am using starline brass not federal, my mistake. Thank you for the advice, I appreciate it.

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Re: too much crimp ?

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