Hello, All, First off I would like to say that I use TAC 1 lube and have been very satisfied with the results so far. I use it in full house 30-30, 303 british, 7.62x54R, 30-06, 7.62x39 with no leading problems. I also use it in pistol calibers 45ACP, 38 spl and 9mm. I am getting a problem with leading in the 9mm. My barrel is leading in the last 3/4" towards the muzzle end. From what I have read so far it seems to be a lube failure. I am using a LEE 6 cavity 356-120gn TC with regular lube grooves. The load shoot accurately. I am using 4.5 gn of unique(which is max BTW), I tried backing off on the powder charge and I am still getting leading at 4gn. I tried sizing the bullets to .356 and .357 and it did not make a difference. My bullets are cast at around 10.5 BHN. I have bought bullets from a commercial caster BHN 11 356-120gn RN and they seem to have less leading when shot in my gun. They have a red lube. My gun is a brand new Walther PPX with regular Ballard type rifling. My question is as follows: Should I try another harder lube to solve my problem or a different powder. I have Unique, Win 231 on hand. I am currently getting set up to start powder coating which might be another way to go.