You have the right to your own opinion, but having shot my full house fire breathing loads I’m my Project 616, I feel like four inches is short enough. What do you hope to accomplish by going shorter? If it’s about carrying, I would suggest a 3” J frame in 32 H&R, then stoke it with Buffalo Bore ammo for “serious” work.
Froggie
I can verify that a 3" J frame with BB's 100g H&R load is a nice combination - with some cushy grips to soak up the recoil. (The BB round slightly exceeds +P 158g 38 Special energies.) It won't shoot to the sights, though - at least it doesn't for me in my (reamed) Model 31.