Adjust sight or train?

At 25 feet, which the OP said he was shooting, bullet weight won't matter one bit.

And i'd bet that there are an extremely small number of handgun shooters on this site that shoot well enough to see a difference in bullet weights at much further distances as well.
 
I'm using 124 gr BDX 9mm right now - awesome ammo BTW. Thanks for the advice everyone, going to hit the range tomorrow and try some snapcaps. Dry-fired for a bit tonight and seemed steady enough; now I just have to mimic that on the range tomorrow :) Will also try some different stances, and some supported shooting. More to follow, and thanks again.

One thing that's helped me and helped some others that I've suggested it to is to follow through with your trigger pull. This means that you don't pull to the "BANG!" only. Instead you pull every time all the way back to the end of the travel, hold it there a moment until the recoil is done then just the same control you ease up to release the pressure. This can be done fairly slowly at first but as you get better you can speed things up until the pressure build, hold, release is as fast as you can pull the trigger. It's the HOW of how you pull the trigger that results in less risk of a snatch at the trigger or of the recoil causing you to flinch.

A good trigger pull should build pressure in a controlled and smoothly ramped up amount for the whole pull. Just let the trigger moves as it wants in response to the pressure buildup rather than worrying about actually moving the trigger. Same with the release. If you hold the trigger back during the discharge and recoil and control the release you'll easily feel the reset of the trigger and you can reverse the pressure release at that point and build up for the next shot.

By working the trigger to fully pull and hold like this you more effectively disconnect your mind from the expected BANG!. This Zen like refocusing of your attention leaves you more free to narrow your whole world view to just the sight picture and the pressure on the trigger.

By the way, you want your overall grip pressure to be that of a firm but friendly handshake. Too light and the gun kicks around in your grip too much. Too heavy and your muscles and tendons for your hands tend to work together and you can't isolate your trigger movement from the supportive, stable hold on the gun.

If it still shoots low and to the left after all this and your other guns all shoot to POA then it will begin to look like the sights are actually off. But for a gun of the quality of SIG it would be a first. All my fixed sight semi autos shoot spot on when I'm doing my job right. And I've never had to touch one of them to alter the factory setting.
 
I have a Shadow, a 226 and a kimber. I find the sig very unforgiving and if I grip with the support hand to tight I always get grouping to the left. Also, for me, if I start using too little finger on the trigger it moves to the left. It took about a 1000 rounds before it worked its self out. Also found that, as usual for most combat guns, it requires you to cover the target with the sight so I always had a tendency to shoot low. Finally changed the sights so it was the same as my other guns. All that said when I do my part it's a fantastic gun!
 
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