It depends on what your gun likes. The 642 I had liked the Speer Gold Dot 135gr+p short bbl load. My other snub nose likes Winchester white box 125gr+p best followed by the
130 gr+p Winchester Bonded. The Speer comes in third.
Any of the above loads are excellent self defense loads for any length bbl that you can get 50 round boxes online for $20 to $25/box. Some companies even give free shipping depending on $’s spent.

Be SAFE and shoot often!