The stock trigger on my 455 .17hmr was pretty heavy and had some creep to it so I ordered a Yo Dave kit as that seemed like the common fix. So I took it apart installed the smallest shim/bushing and a medium heavy spring - whoa, yikes scary little engagement and way too light of a pull for a safe hunting rifle. Upon seeing how things work and laying a feeler gauge on the sear there was about .021" of engagement, the smallest bushing .016" leaving only about .005 for engagement - not good. So I dis assembled again - removed bushing and went to work on the sear old school with a stone. Worked it over until I now have about .014" of engagement and the heaviest spring from the Yo Dave kit. The trigger is now very nice breaking about 2.5# with no perceived creep. Moral to the story is that if you are going to work on the trigger of your 455 take it apart first and check the engagement of the sear before you spend $35 for a kit that may not work.
If anyone needs a kit, I have one minus one spring that I will sell cheap.
