Sacerdote

As already stated, rimfires are difficult to reduce without getting light strikes.You can get light strikes with any rimfire be it auto, revolver or whatever if the hammer spring is weakened

Back to the 617

I replaced the factory mainspring with a Wolff standard power mainspring(although standard, it's much better than factory) and a 13lb trigger return spring. The Wolff mainspring pack will come with 3 or 4 different rebound springs

My 617, after many rounds, has a trigger pull as good as any K or L frame centerfire revolver and near 100% reliable. Probably better than most box stock L frame centerfire

I use my 617 as a practice gun for ICORE and IPSC so it gets quite a work out. The 617 4" with JM grips makes a great practice gun if you compete with a 625JM


To answer your question
"Is it possible to have a 617 trigger to match a 686 or come close"?

Yes and probably better with 2 springs(mainspring and 13lb return spring) and a few rounds(maybe 5,000 or so)