SP of SPM for .357mag with AA#9

KAB55 · July 25, 2009, 10:14 AM

Do I need to use a mag primer in a .357mag load with AA#9 powder under a 158grain jacketed HP. All of the load data seems to indicate a SPM primer, but I can't seem to find any. Have WSP primers, but don't want to load it if it won't work well.

GP100man · July 25, 2009, 01:03 PM

aa#9 , 296 , h-110 are all ball powders & likes magnum primers , you can get satisfactory results with regular primers .
when shootin em probably the only way to tell the difference would be using a chronograph.
don`t go below published data.
some WSP say on the box for standard or magnum loads?????

GP100man

joneb · July 25, 2009, 01:40 PM

I have some older Accurate data that lists CCI 500 primers for .357 mag. I have had very good results using WSP and CCI 500 with AA#9 behind 158 and 180gr jacketed bullets. When I began using AA#9 I worked from the starting loads for 158 jhp w/CCI 500 and soon had over pressure signs at 25% of the load spread, the flattened cratered primers and stuck cases were gone at 50%

My current loading for the 158 XTPhp are about 75% and for the 180 XTP are at 90% in a Ruger Sec. Six w/a 2.75" barrel.

KAB55 · July 26, 2009, 02:23 PM

Thanks for the feedback, I'll work up a load using the WSP's

KAB55 · July 28, 2009, 10:47 PM

The question is now mute, Grafs came through with a backordered case of CCI SP mag primers along with 2 cases of regular CCI SP and CCI LP primers, should have them on Thursday. Been waiting for CCI's since March!

freakshow10mm · July 28, 2009, 11:04 PM

Any handgun load over 10gr automatically gets a magnum primer.

July 25, 2009, 10:14 AM	#1
KAB55 Member Join Date: April 2, 2009 Posts: 23	SP of SPM for .357mag with AA#9 Do I need to use a mag primer in a .357mag load with AA#9 powder under a 158grain jacketed HP. All of the load data seems to indicate a SPM primer, but I can't seem to find any. Have WSP primers, but don't want to load it if it won't work well.

July 25, 2009, 01:03 PM	#2
GP100man Senior Member Join Date: August 1, 2007 Location: Tabor City , NC. Posts: 1,969	296 aa#9 , 296 , h-110 are all ball powders & likes magnum primers , you can get satisfactory results with regular primers . when shootin em probably the only way to tell the difference would be using a chronograph. don`t go below published data. some WSP say on the box for standard or magnum loads????? GP100man Last edited by GP100man; July 25, 2009 at 01:07 PM. Reason: add on

July 25, 2009, 01:40 PM	#3
joneb Senior Member Join Date: December 10, 2005 Location: Central , OR Posts: 1,888	I have some older Accurate data that lists CCI 500 primers for .357 mag. I have had very good results using WSP and CCI 500 with AA#9 behind 158 and 180gr jacketed bullets. When I began using AA#9 I worked from the starting loads for 158 jhp w/CCI 500 and soon had over pressure signs at 25% of the load spread, the flattened cratered primers and stuck cases were gone at 50% My current loading for the 158 XTPhp are about 75% and for the 180 XTP are at 90% in a Ruger Sec. Six w/a 2.75" barrel.

July 26, 2009, 02:23 PM	#4
KAB55 Member Join Date: April 2, 2009 Posts: 23	Thanks for the feedback, I'll work up a load using the WSP's

July 28, 2009, 10:47 PM	#5
KAB55 Member Join Date: April 2, 2009 Posts: 23	The question is now mute, Grafs came through with a backordered case of CCI SP mag primers along with 2 cases of regular CCI SP and CCI LP primers, should have them on Thursday. Been waiting for CCI's since March!

July 28, 2009, 11:04 PM	#6
freakshow10mm Junior member Join Date: January 23, 2008 Location: MI Posts: 1,398	Any handgun load over 10gr automatically gets a magnum primer.