What kind of pistol/revolver are you going to use? I use and 1858 with a conversion cylinder and pure lead bullets. They work great, but it has deeper rifling because its a cap and ball gun. Its my favorite pistol and I can hit a pie plant all day at 40 yards with the 8" barrel.
Modern revolvers like my Glocks or P365 don't throw lead bullets past ten yards accurately. The rifling is shallow and the same is with new inline muzzy rifles. I have done a lot testing with cast pistol hollow point bullets.
Lead 10 yards at most
Wheel weight alloy - good shooting but doesn't expand as it could
1/2 and 1/2 Wheel weight and pure lead - Make a 8 hardness and group fair enough at 20 yards and expands awesomely.
here is expansion for pure lead and Wheel weights https://archeryrob1.wordpress.com/20...hollow-points/
Here is expansion for the half and half alloy. https://archeryrob1.wordpress.com/20...hollow-points/
There is supposed to be replacement barrels for semi pistols like Glocks to shoot cast, but I don't know enough about them to speak on them. Mine shoots them fine IF they are harder than Pb lead