Due to the ridiculous 30-day waiting period here in Kali, I am at least 30 days behind you, but I am also seriously looking at a Glock 20 (Gen3) and it seems a worthy candidate for handloading. Lead-free required here as well.
I'll be peeking in and would be interested in your account of how things go.
I have about 8 more days of the 30 day waiting period.