Discussion in 'Handloading and Reloading' started by Lennyjoe, Sep 13, 2021.
Anyone have any good experience specifically in the .357 Sig?
Maybe some help?
357 SIG is a fun one to load for! There are a lot of people out there that are like “oh it’s a bottleneck cartridge, too much work blah blah blah” when you literally load it like any other cartridge.
I typically run my brass through my 750 once to prep it as follows:
FW Arms Primer Popper Decapping die
Lee Universal decapping die (to extra ensure zero remaining primers)
40 S&W carbide sizing die (sizes the body)
Redding 357 SIG sizing die (sizes the neck and shoulder)
Thats just what I do, but you can do all of that with just a 357 SIG sizing die if you want to as well. Then it gets wet tumbled and is ready to load.
Loading consists of the following on my XL-750:
Redding 357 SIG expander set to just open the case mouth enough to hold a projectile during indexing
Hornady case-actuated powder measure with a rifle-style insert that does not enter the case in any way
Hornady Powder Cop die
DAA Mr. Bulletfeeder die with pre-loaded projectile tubes
Redding 357 SIG seat/crimp die set to seat and crimp just enough to remove the flare, NO MORE. All crimp is supposed to do is remove the flare, the projectile is held by neck tension only.
Have loaded thousands with that style setup with good results using AA#7 and CFE pistol with good results, as well as X-Treme 124gr FP’s, and RMR 124 gr MPR’s.
I moved on to Longshot as it was more common on my LGS shelf ... and easier to meter being a ball powder .... and a little more velocity ....
But if I had a supply of Blue Dot on hand ....I would shoot it without worries...
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