m58 S&W

**shadowrider** · 01-28-18, 23:25

Originally Posted by gaijin

H110/Win 296 do need a magnum primer.
I prefer Federal or CCI as they’ve been most accurate for me.
The m58 load, using AA9 does not require a magnum primer- per AA load manual, but I use Federal magnum primers as I get much smaller ES with them.

I see the same in .357 Sig with #9. Drastically lower ES and SD. Gorgeous revo and rig.

**gaijin** · 01-29-18, 09:36

I'd actually experienced a micro "hang fire" with a moderately reduced load of AA9 and Standard LPP's.
ES's were pretty extreme for handgun ammo as well.

The Magnum primers sorted it out. Live and learn I guess.

**shadowrider** · 01-29-18, 10:14

Originally Posted by gaijin

I'd actually experienced a micro "hang fire" with a moderately reduced load of AA9 and Standard LPP's.
ES's were pretty extreme for handgun ammo as well.

The Magnum primers sorted it out. Live and learn I guess.

Another thing I saw was that I use a note pad to write down my chrono readings and I had a lot more unburned powder kernels on it with standard primers. Definitely a noticeable amount. That and the chrono told me that magnum primers are the way to go. Groups at 15 yards were fine with both so ES and SD don't always mean a lot at pistol distance but the chrono numbers do tell a tale. I used to shoot a lot of 296 in magnum revolver loads and it's a magnum primer only powder. AA#9 is very similar and my experience makes me wonder why they say regular primers are recommended. I've seen no difference in pressure signs even at max loads so I guess their safety factor in their load data is sufficient.