Two very popular sizes of lead bullets for 38 special are 125 gr and 158 grain. Obviously the lighter bullets will have greater velocity in most loadings.
My question is each of the these two sizes, would you prefer soft lead (about hardness 12), or harder alloy bullets?
For soft bullets I would guess from reading around that 1200 fps and below should not lead if the bullet diameter is fairly the correct size compared to the bore diameter, the lead bullets need to be very slightly larger, say .001 larger?
Given that normally these bullets are purchased in lots of 500 the trial and error method can lead to being stuck with bullets you later chose not to use. So I think it will be prudent for me to have in advance a good idea what perhaps hardness is more likely to end up being 1) non leadings and 2) provide better defense terminal effects.
reference: I have just gotten a S&W #10 5" barrel (used) revolver and never had a 38 special before. I plan to keep it in a quick access safe for personal home defense. Thank you.