First/last report
The mold showed up sat. Cast up about 20 or so on Sun morning. Like all the Lee molds I have used, it tossed out pretty bullets almost right away. My fear was that they would be too small for the Peitta but a test fit in the spare cylinder proved otherwise. I picked out 6 and started to lube the grooves with bore butter (a bit of a pain) and loaded the cylinder (out of the gun) with six charges of 25 gr of 3f, put the cylinder in the gun and tried to load a bullet. It wouldn't fit, the frame around the loading lever is in the way and the loading lever won't go far enough forward to allow you place the bullet right under it to load.
I removed the cylinder and used a short starter to start each bullet up to the second ring (not easy). Then I had to put the cylinder in my vise and tap the bullets down using the short starter and a rubber hammer (did not like that) to seat them but they each shaved off a very nice little ring of lead while loading.
On the range...target: 5 in. square of 3/8 plate steel hanging form chains. Steady on a post 15 yards away, rang the bell 5 out of 6 times (most likely my fault, I think I flinched). Seemed to have at least as much power as my 9mm with 115 gr FMJ.
In summery, easy to cast, lubing the grooves is messy and time consuming, need a loading stand to load (at least with the Peitta) accurate and hard hitting. I will be ordering a .451 round ball mold.