.357 load too hot?


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Whiskey_Sour
April 10, 2012, 12:55 PM
I was loading a mid range load of HS-6 with Zero 125 gr. Jhp and Remington small pistol primers. All was good until I changed to Winchester small pistol magnum primers. I noticed the Winchester magnum primers were flattened. Is this load now too hot? S&W 627 PRO, 9.8 GR. HS-6 mixed brass. No problems with extraction, or unusual recoil. Thanks.

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rcmodel
April 10, 2012, 01:10 PM
It's probably just the primer is softer.

Your 9.8 grain HS-6 load is the Starting load according to Hodgdon data, so it is very unlikely you have excess pressure.

rc

moxie
April 10, 2012, 01:13 PM
Flattened primers in .357 loads are not unusual IMO.

rcmodel
April 10, 2012, 01:18 PM
You might look again.
125 XTP and 9.8 HS-6 is the starting load.

From Hodgdon site and my Hodgdon manual:
Start = 9.8 1,493 34,400 CUP
MAX = 10.9 1,629 42,100 CUP

rc

moxie
April 10, 2012, 02:15 PM
My electrons are faster than yours. Correction was already made.

gamestalker
April 10, 2012, 02:17 PM
When you switched primers, it probably changed the pressure curve to some degree. It's not that your load is too hot now, just the rate of pressure climb is now different. If the flattened primers bother you just switch back to standard primers.

GLOOB
April 10, 2012, 03:17 PM
Lots of people have noticed the current Win primers flatten more than other brands. The cups are soft, is all.

Whiskey_Sour
April 10, 2012, 09:47 PM
Thanks for the replies, I was thinking hard about pulling 150 bullets :banghead:

ArchAngelCD
April 11, 2012, 12:38 AM
It's been my experience Winchester primers seem to flatten easier than other primers. Add to that, like said above, flat primers are not all that uncommon in the .357 Magnum. Flat primers are not a good pressure gauge in handgun calibers.

Whiskey_Sour
April 11, 2012, 01:09 PM
Thanks, that helps put my mind to rest.

Whiskey_Sour
April 11, 2012, 07:34 PM
Well...decided to "bite the bullet" and buy a caliper. The loads that had no flat primers (Remington 1-1/2 small pistol) had a COL of 1.57, the loads with the Winchester magnum small pistol primers that flattened were COL 1.56. COL is supposed to be 1.59. Is this enough difference to worry about?

kingmt
April 11, 2012, 09:45 PM
No.

ArchAngelCD
April 12, 2012, 03:13 AM
Well...decided to "bite the bullet" and buy a caliper. The loads that had no flat primers (Remington 1-1/2 small pistol) had a COL of 1.57, the loads with the Winchester magnum small pistol primers that flattened were COL 1.56. COL is supposed to be 1.59. Is this enough difference to worry about?
You should crimp in the cannelure with revolver bullets. The OAL in the manual tells you where they crimped the bullet they used.

In a revolver round that long 1 100th of an inch means nothing...

eldon519
April 12, 2012, 09:12 AM
I shoot mainly Winchester SPM in my .357 loads, and even the magnum has a soft cup. Those things flatten if you just look at them funny, especially in Remington brass where the pocket mouth is a little more beveled.

Whiskey_Sour
April 12, 2012, 09:29 AM
Good, I had crimped at the cannelure, and have got it through my head that the WSPM primers flatten easily. Thank you very much for the feedback!

loneviking
April 12, 2012, 09:32 AM
Switch over to CCI primers, which are quite a bit harder. BTW, you'll know if you're getting a hot load with a .357 when you have to beat the shells out of the cylinder! :what:

Steve C
April 12, 2012, 12:59 PM
Low pressure often mimics high pressure in regards to how flat the primers look so its quie possible that your start load low pressure is causing what you are seeing. Unless the primer is as "flat" as the picture below shows on the right it isn't really flat.

As long as the round goes off there's no reason to worry or chanage primers.

http://www.photoddgraphy.com/photos/1248094187_RUJs2-L.jpg
Note: This picture and link was borrowed from a post by RTMiller on 4/11/11.

Whiskey_Sour
April 12, 2012, 10:22 PM
Yeah, the primer on the right is more or less what they looked like, especially the Fiocchi brass. Like I said, there was no unusual recoil, and cases were not hard to extract. I did also shoot some factory Remington 125 gr jhp, and those REALLY DID get my attention :D On a side note, I ordered some X-Treme 158 gr copper plated SWCs. Anyone with a good starting load of those, HS-6, and WSPMs ?

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