I've shot lotsa' .357's in 2 1/2", 4", and 6". I prefer a 140gr. HP in what ever brand.
I've shot a lot'a critters with the above and I see no practical difference (inside of 25 yrds) in expansion between 2 1/2", 4", or 6" barrels. A 140gr. HP works very well indeed.
Not to heavy, not to...