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357 Sig Plinking Recipe

3K views 19 replies 11 participants last post by  dkf 
#1 ·
Sitting here at my press, pouring pounds of Accurate No. 9 into the hopper, I realized I'm using a lot of this stuff. Pulled out my notes, and at 12.5gr under a 125 RMR plated TC, I'm using more of it than in my 10mm under a 190 TC. That's too much.

What's everyone's plinking recipes for 125s? Looks like RMR has dropped the above bullet from their catalog, so I'll probably move onto Berry's new 125 TCHB on my next go round. $100/1000 isn't terrible, unless someone knows of an even more economical solution.
 
#3 ·
Longshot is more economical than aa#9 & you still get top performance. AA#9 is more accurate for me but LS works as does BlueDot. 1300fps is about max foe plated with good accuracy, so even power pistol & be86 work there.
 
#4 ·
It would seem to me that AA9 is a little too slow burning for the case volume to bore diameter ratio of the 357 sig especially with a 125 grain bullet.

I just looked at some data that shows that you will use less of a faster burning powder to obtain similar velocities. I use AA9 in the 357, 41, and 44 magnums, and in the 10mm with 200 grain bullets, but use AA7 and Blue dot for 180 grain bullets in the 10mm, and all of these cartridges have larger case capacities relative to the bore diameter than the 357 Sig which require slower powders, and heavier bullets also need slower powders.

9.2 gr. of No. 5 with a 124 gr. xtp could give you 1,325 fps, 11.0 gr. grains of No. 7, 1,320, while it will take 13.0 gr. No. 9 to give you just 60 more fps or 1,387 fps and that is a maximum load and a compressed load.

here's where I got that data:

http://www.reloadammo.com/357sig.htm

The BEST source of reloading data is the Loadbooks USA individual books for specific calibers because they use data from every major reloading manual but for one or two calibers only.

https://www.midwayusa.com/product/955169/loadbooks-usa-357-sig-reloading-manual
 
#5 ·
The reason people like AA9 in this round is that it is slightly compressed, and helps avoid bullet setback if you don't have a bullet with a cannelure for a good crimp. Being that I'm using plated bullets, and shooting steel, I don't mind applying a heavy crimp with the FCD and putting a little ring in the bullet to hold it, so I do think it's time to move to a faster powder. I tend to shy away from Longshot since it sounds like a naval deck gun going off when you pull the trigger, but I do have some AA7 laying around. Also have some of the new W572 (and some old W571 & W540) that might work.
 
#8 ·
AA#9 is actually a great choice, widely used by serious 357sig shooters. Almost impossible to overcharge & max safe velocities. If you are willing to lose 50fps, then previous mentioned medium burners work well.
 
#10 ·
#17 ·
I use LS, but as you said, you are bringing in the naval fleet with each shot.
I run 7.8gr under a 125gr cast bullet from midatlanticbulets.com

Have been having issues with my sig loads on my new dillon 550. seems every time I go to load, I am getting a new error. odd as they sit idle and not fussed with between loadings. it's really putting a damper on my loading and shooting, sig is my favorite round to shoot.
 
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