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Nathan · April 13, 2013, 11:36 AM

CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information.

I'm confused!

My load is WIN SPM primer, Federal Brass, Longshot 8.4gr powder, Berry's 158gr [email protected]"COL

This should come out of a 4" barrel at 1394 fps, driven by 43200 CUP.

My chronograph says 1116fps. Where did my 260 fps go? What does that mean for primers. Primers look like pressure is low to moderate.

Group for evaluation was .625 @ 15 yards, which is good for me. That is shooting over sandbags, from a bench.

Should I go hotter? Should I be happy? Aaaaah! My issue is I want to load 500 at this load and probably will. Just wish I could explain the velocity mismatch.

April 13, 2013, 11:36 AM	#1
Nathan Senior Member Join Date: July 1, 2001 Posts: 6,331	Help with 357 mag load CAUTION: The following post includes loading data beyond or not covered by currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The Firing Line, nor the staff of TFL assume any liability for any damage or injury resulting from use of this information. I'm confused! My load is WIN SPM primer, Federal Brass, Longshot 8.4gr powder, Berry's 158gr [email protected]"COL This should come out of a 4" barrel at 1394 fps, driven by 43200 CUP. My chronograph says 1116fps. Where did my 260 fps go? What does that mean for primers. Primers look like pressure is low to moderate. Group for evaluation was .625 @ 15 yards, which is good for me. That is shooting over sandbags, from a bench. Should I go hotter? Should I be happy? Aaaaah! My issue is I want to load 500 at this load and probably will. Just wish I could explain the velocity mismatch. Last edited by Unclenick; April 13, 2013 at 04:47 PM.