with pc you can run pure at any velocity with no leading or gas check but what it doesnt change is harder is almost always more accurate. when i shot comp i used linotype for matches and practiced with ww. problem is ww unless you short out the stick ons is much softer than it used to be and most ww you get these days are 2/3s stick on which is close to pure. i ran into about 3000lbs of pure for free and my ww stash is down to about 1500lbs. so what ive been doing for most of my casting is using 50/50 ww/pure+ 3% tin. pc coating and water dropping right out of the oven. that gets me back to about 11-12bhn which is what the old wws were. i dont shoot comp anymore so a 1/4 in or even an inch better group doest justify searching for more alloy. most of my shooting is combat traing and pounding steel plates. im down to 200lbs of lyno so im pretty frugal with it. adding antimony will work but its hard to melt it in so if you want to go that route rotometals has bars of lead/antimony already combined that mix in easily. sadly the days i used to run into 1000lb buys on lyno cheap are over. i havent found any for 5 years other than buying it on rotometals. one thing id never do again is lubesize bullets. pc is easy, doesnt lead and keeps you gun as clean as jacketed.
i did a torture test of my psa dagger (glock 19 clone) 2 years ago took out a bit over a 1000 rounds loaded in mags not to test pc but to test the gun. took the wife along with my hopper mag loader and she refilled them as fast as she could . i caught up to her at about 1500 rounds. first day with pc coated bullets out of 4 different molds. what i did was shoot it all as fast as i could pull the trigger. gun was smoking hot but when i got it home and tore it down it could have stood a cleaning but truthfully i could have slapped some oil on it and done it again. 2 days later i went out with the same setup with lube sized bullets. toward the end it was so greasy it was getting tough to grip and started choaking on the cheap ets mags but ran all the rest. my hands were black. did i tell you picking up 3000 9mm cases is a pain in the a--. dont know why i didnt take a tarp and put it down. what i learned was the dagger is a great gun. i got it with 10 pmags for 300 bucks (little more today) so take away what the mags cost and i paid about 200 bucks for it which is a 1/3 the price of a glock. is it as good as a glock? probably not but then im a glock fan boy

would i trust my life to it? absolutely which is more than i can say for MANY under 300 dollar guns. if your on a tight budget buy one!! the other thing I already said. ill use up my lube sized bullets but my star sizer" only use is sizing pc bullets i dont have lee sizers for