help. 9mm accuracy problem

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blchow

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Hi, just wondering if anyone out there can offer an opinion on an accuracy problem with my 9mm loads. I have a feeling it probably has something to do with my reloading process.

I am finding that my reloaded ammo is shooting FAR to the left when compared to similar factory ammo. Typically, my groups with the reloaded stuff is about 4 inches left of my point of aim at 25m. However, when I switch to factory ammo, it's dead on, regardless of brand. I have benchrested the pistol and have had others shoot the ammo in different guns and the problem is consistent with my reloaded ammo. I have ruled out the idiot pulling the trigger :)

I have tried to vary the charge and the OAL of the loaded round with no improvement.

I'm shooting Speer 147 gr TMJ bullets through a Sig 226 with 3.4 gr Titegroup. Chrony shows an average of 900 fps. I have also switched to Hornady 147 XTP bullets and the problem still exists.

Using a Dillon 550 press, all Remington cases, CCI primers, seated to 1.130" and slight taper crimp.

Has anyone run across the same problem? I'm thinking of switching powers to rule out a powder problem. Any insight would be appreciated.
 
When you were shooting factory ammo was it also 147 gr bullets?

While you are off by 4"s how are the groups?
 
Yes, the factory loads I'm shooting is 147 gr FMJ (mostly Remington). As far as groupings go, my reloads are grouping better than the factory stuff...but far to the left of course.
 
K..I'm a rookie reloader so this may be a kind of dumb scenario. :D

Are you the first owner of the pistol, and if you are did you have to adjust your windage when you bought the gun?

Just seems to me that maybe it's shooting factory wrong, and the sights were compensated, which now throws the good ammo you are feeding it "off".


Other than that, I'd say try some other weight bullets (factory) and see if POI moves as drastically.
 
Your reloads shoot 4 inches left in other guns too? That's very strange. If there are large velocity variations you'd expect vertical stringing, I can't see it being powder/ignition related.

Are your bullets getting deformed during seating or crimping? Pull a bullet from a loaded round and measure its dimensions, compare it to an unloaded bullet.

Ummm.... are you shooting outdoors in a strong wind? ;)
 
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If you can, get someone else to load some rounds with that weight of bullet. Different powder and different press. See what happens.
 
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