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Old 05-15-2020, 04:37 PM
IrishPsych IrishPsych is offline
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357 Mag - Collet Crimp Location? 357 Mag - Collet Crimp Location? 357 Mag - Collet Crimp Location? 357 Mag - Collet Crimp Location? 357 Mag - Collet Crimp Location?  
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Default 357 Mag - Collet Crimp Location?

These 357 will be semi hot rounds with 13.5gr if 2400 and with a coated 158gr rnfp bullet.

Manuals differ in OAL. Some have 1.590 and others have 1.550 or 1.570.

Bullet Iím using will need a OAL just of 1.570 in order to crimp at the crimp groove.

Photo below is 1.575 and crimped just shy of the groove. Iím also using the Lee COLLET crimp die. Not a taper crimp or roll crimp. Was suggested to use in rounds that are used for not revolver and rifle.

Does that round look good?

Should I let it out to say 1.580 and donít worry bout the crimp groove?

I can also run it a little shorter but then pressure spikes will likely happens using 2400 powder.


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Old 05-15-2020, 05:58 PM
38SPL HV 38SPL HV is offline
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Looks good but I prefer a moderate heavy roll crimp. I tried using Lee collet die but I found that it reduced case life since when done with a firm crimp would work the case mouth too much (those small indentations characteristic of this die will ultimately fail in my experience).

I use Redding Profile or Lee FCD on my magnum level loads when crimping in crimp groove, Lee taper crimp when crimping on the bullet (and yes, bullets in magnum level loads will stay put (not move) with the taper crimp even in my Ruger SP101).

By the way, your 13.5 grs/2400 with 158 gr cast bullet is an excellent load...itís velocity exceeds Rem/Win/Fed 158 gr JSP 357 Magnum factory loads with the added benefit of being hard cast with better penetrative capabilities on game.

Last edited by 38SPL HV; 05-15-2020 at 06:09 PM.
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Old 05-15-2020, 07:13 PM
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Crimp it in the crimp groove; the pressure differential will be inconsequential and to do it right you should work up to your max load anyways, by testing and observation. That's why they put the crimp grooves in bullets meant for 357 anyways. And I'm also one to use a good roll crimp as I find it does better and has less ES and SD with a firm roll crimp. All your slower "magnum" powders do better with a good firm roll crimp in my experience with 357.
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Old 05-16-2020, 01:40 AM
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That bullet has a very fine/small crimp area.......... (Cast Performance ? )

looks to me, like you need to seat that bullet just a little bit more to hit the crimp area of that bullet.

Most of my lead bullets have a crimp area at least the width of a penny, or more.

It does not hurt if you don't use the crimp indentation but it does make the crimping job easier, if the case can use it.

Have fun.

Last edited by Nevada Ed; 05-17-2020 at 12:14 PM.
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Old 05-16-2020, 01:57 AM
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BLUEDOT37 BLUEDOT37 is offline
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Quote:
Originally Posted by IrishPsych View Post
I can also run it a little shorter but then pressure spikes will likely happens using 2400 powder.
Welcome to the forum!

Not sure what you mean by this? You're well under max & a few thousands won't make a difference here. 2400 is very forgiving.

Ditto the moderate/heavy roll crimp in the middle of the crimp groove, especially when using a slow powder.

And you only need regular primers with 2400 (Speer/Alliant manual).

Note the COAL" in your records but disregard what other bullet's COAL" measure to as long as yours chambers properly in your revolver when seated to the cannelure/crimp groove.

Did you work up to this load? Always best to & avoid surprises.

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Last edited by BLUEDOT37; 05-16-2020 at 01:58 AM.
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Old 05-18-2020, 01:50 PM
Maurice H Maurice H is offline
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As others noted, seat your bullet to a depth that puts the mouth just shy of the top of the crimp groove and apply a solid roll crimp, which is important for two reasons; prevent creep and ensure proper ignition/pressure.
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Old 05-19-2020, 03:04 PM
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A few decades ago when I reloaded my first revolver round ('69) I figgered the bullet designers knew where to place the crimp groove. Did some research and the most common answer was "seat to the crimp groove and roll crimp, and fergit book OAL". And this was waaaay pre-web...

Last edited by mikld; 05-19-2020 at 03:15 PM.
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Old 05-19-2020, 04:09 PM
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A good/proper crimp needs two main things to happen.

#1
all the cases should be the SAME over all length.

#2
the bullet is seated into the case the correct amount.

Hopefully you have quality bullets with the cannelure in the same area of all bullets.....

and your die is tight without any movement and you use a "Full stroke" each time, for the operation....

anything else is nit picking.
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Old 05-19-2020, 07:35 PM
wv109323 wv109323 is offline
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It would be best to use the crimp groove and roll crimp into it. This with keep the bullet from moving under recoil. The hotter you load the more apt they are to move under recoil.
Your max. load wiil somewhat depend on seating depth. Load a few under your desired load to make sure there is not a pressure problem.
The crimp groove was located so that the bullet would fit into all applications.
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