I haven't tested them for hardness but so far I have had good luck in 9mm and 357 sig in minor using a 135 grain round nose.
I'll cross that bridge when I get to it. I don't even know where I could source proper lead down here, the internet doesn't give me anyone a place up north. Paying for lead would reduce my eagerness to cast.
Sizing from 358 to 356. Maybe the handle casting wasn't great, it broke off near the ball.