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From what I'm reading it's adjustable from 800gr/1.75 pounds to 1500gr/3.3 pounds. Places do make spring kits to lessen the trigger pull weight. Hope this helps.

1½ pounds to 4 pounds

Pat, this Trigger is adjustable for weight creep and over-travel from 2 to 4lbs. The factory trigger can be adjusted to about 2 lbs, there's a replacement trigger spring on ebay for 10.49 that will take it to 10 oz if you like...I have used several of them and they are great, best money you can spend to improve your 457, the spring also can be adjusted for higher pull weight as well. Cheers and stay safe!

I was able to adjust mine from just over 4 lb to 1.8 lb with no problems