I've had a P229 since 2001, two barrels, a .40 S&W and .357 Sig, and have shot very little jacketed ammo in it. Thousands of cast. There was some leading to begin with but a firelap job with some of Veral Smith's firelap compound smoothed them up to the point that leading is minimal and usually comes out with nothing but a tight patch saturated in bore cleaner.
Just lately bought a .22 LR conversion kit for it. That's a whole 'nother fun story...........