I was getting 2" (at best) groups with factory ammo and 1.5" groups with my handloads out of my brand new Encore. I ordered the size one and two hinge pins from Bellm, along with the heavy duty lock-up spring. I put a caliper to the size 1 and found that it was the exact same size as my factory pin, so I went immediately to the size two, which was about .004" larger in diameter. Had to use a fair bit of CLP and a drift pin with mallet, but it went in pretty easy. Gun now shoots .750" as a standard with my handloands. Sweet trigger on the gun too that I had my smith do. All that was needed was a little moly and it was a perfect 2.5 #s, no travel, or overtravel at all. Great hunting trigger. I'm pleased with it.