This year before Deer season my wife, god love her, got me a .357 emf hartford. All I can say is this gun is Now my favorite ever. This model has a 20" barrel and the saddle ring, which i will be putting a single point harness from wilderness on it, if and when they ever ship it to me.
I used the 158 fusion ammo, seemed ok, but put a hole the size of a fist in the deer at 80yds and did not pass through. I used 180 grn cast core, punched a hole clear through both shoulders at 150 and change, very little internal dammage (too long of story of why i took that long of a shot).
I also used a 158gr hollowpoint, i would avoid these, they are the worst of the bunch, these were hi shoks, and at 40yds hit bone and deflected up to the spine, deer kept moving, had to be shot twice, it was awful, the second shot wasnt that impressive either. I think i have to agree with most fellas on this one and say 158grn jsp is a good choice.
I Havent shot for groups yet but offhand i can hit a 10in plate everytime at 100yds with the opensights now (had to practice a bit).
wanna take it yote hunting next weekend, have some 125grn soft points and the 158s yet, we will see if i can call somethin in.
as far as leng goes, its a short little gun to begin with, so id just pick the one that feels the best to you, your really not going to see much diff either way.
I hope you find what you are looking for, and have fun.
good luck
Dave