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 .357 load with IMR SR4756
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sskate
Starting Member

USA
1 Posts

Posted - Sep 06 2009 :  18:13:18  Show Profile Send sskate a Private Message  Reply with Quote
I have an older Sierra manual, It showed a load for a .38 special for SR4756 powder of 8.7 grs with a 125 XTP and a load of 8.3 with the 158 xtp. On the Hodgdon site it showed a max load of 6.5 gr SR4756 with the 158 xtp in the .357 chart. Seems very strange that the Sierra .38 special load is quite a bit more than the Hodgdon .357 with the same powder. Anyone have any information on loading 8.5 grs of SR4756 in a .357? With the discrepancy in the two I don't feel like damaging my S&W Model 19 or me if there is a problem with that load. I loaded up a couple hundred rounds and don't want to have to take them all down if I don't need to.

1600mga

Winchester 69
Senior Member

USA
256 Posts

Posted - Sep 07 2009 :  06:21:12  Show Profile Send Winchester 69 a Private Message  Reply with Quote
My old (47th) Lyman manual shows a max of 5.4 gr. of SR-4756 with a 158 gr. jacketed bullet for a pressure of 13,800 C.U.P.

You'd be amazed at how they drink their coffee here. - M. Dundee
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rg1
Average Member

103 Posts

Posted - Sep 09 2009 :  04:57:38  Show Profile Send rg1 a Private Message  Reply with Quote
Here's a site that has IMR data that you can download:
http://www.imrpowder.com/pdf_reload.html
I think it is the last version of IMR's Handloaders Guide. You can download rifle, pistol, or shotgun or all three.
Using Remington cases and primers it says:
.38 Special
6.1 grains with RP 125 sjhp--925fps--15900 cup pressure
5.2 grains with Hornady 158 jfp--705fps--15300 cup
________________
357 Magnum listed: Rem case-RP 5 1/2
8.6 with Rem 125 sjhp--1180 fps--35800 cup
7.5 with Rem 158 gr sjhp--940 fps--35700 cup
IMR's warning is to reduce 10% from the above and work up.
Good idea to check several sources when there is questionable data. SR4756 is pretty fast to use in .357 Mag loads.

Edited by - rg1 on Sep 09 2009 05:00:36
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