Another update - bought a new Lee XR priming tool and shell holder and assembled loads with 5.4 grains of BE-86, Winchester SP primer, and a 124 grain FP plated bullet. Loaded 100 rounds and fired them today. No misfires, good accuracy, and seems to mimic the recoil and report of our old 9mm service load (127 grain Ranger +P+). I am happy now.
Reading the description, it says it uses the same body as the old version; it looks like it's just the plastic parts that are new. I always found that doing more than about 50-100 rounds with it in a sitting led to painful hand cramps, hence my strong preference for priming on the press.
I really like the primer rig they sold that went in the press like a die, but i think they quit selling it. I use it with one of their simple singe stage presses and it is great.
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Call me the voice of dissent, but your 228 should be going through whatever factory hard primers you put in it. You said the pistol had been "resprung" with a TGS spring kit. Are you referring to a standard parts kit, or perhaps one of the reduced power Grayguns kits? If the latter, and your envisioning using the pistol in a defensive capacity, I'd be thinking about putting a stock weight hammer (main) spring back in the gun.
As others mentioned, taking the slide down and ensuring there isn't any debris in the firing pin channel is a good idea. Be aware though that burrs can form on the firing pin itself causing light strikes. And they can be REALLY difficult to diagnose. If you've ruled out everything else, replacing the firing pin itself may remedy further issues.
I've dabbled with mainsprings as low as 17 and 18 lbs with good success trying to improve felt trigger weight in my match guns. Regardless, my work guns get full power ones.
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I ordered the kit thinking it was a standard one. The trigger pull on the gun feels lighter than almost all other classic Sigs I have handled.
At this point, the P228 is strictly a range toy since my work gun is a Glock 23.
It may become an EDC post retirement in probably January 2018, unless someone pisses me off to the point where I punch my KMA card earlier.
At the next service interval, a heavier main spring will go in.