Greetings:

My rounds failed to cycle in a Sig Sauer P336. Just learning how to reload cartridges, starting with 9mm Luger. Using a Lee Anniversary Press Kit and Lee 3 die set for 9mm.

Made up a small batch (10 rounds) with carbide sizing/decapping die, then expander and bullet seating dies.

My supplier sold me Winchester 231 powder for 9mm. Unfortunately, neither Lyman 49th ed. nor Lee's 2nd edition provides a starting charge for 115 gr copper jacketed bullets. I used the charge listed for cast lead bullets, 3.9 grains. This seemed a conservative starting point.

I test fired my Sig with Remington UMC factory ammo. Weapon functioned fine. Photo shows 7 casings from that source.

Test fired the reloaded ammo and the rounds fired but FTE and did not move the slide sufficiently to the rear to chamber a new round. In addition, I notice the spent casing has dark scorch marks.

I surmise that increasing the charge by another 0.1 or 0.2 grains would begin to actuate the slide more fully.

Wondering why the reloaded cases have so much scorching in comparison to the factory shells. I had full sized and decapped with the first die and presume the cases should seal in the chamber.

Suggestions welcomed on things to adjust/check in my reloading process. I will keep making small batches until I get them to work like the factory ammo.

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