I ordered some tin and did another casting session today. Mixed up 10 lbs of lead and managed to cast about 250 bullets and got most of them lubed. The addition of the tin seemed to make a difference, as the shoulders were much sharper. These are two I plucked out of the batch.

[Linked Image from i.imgur.com]

Now, I have replaced the older Blackhawk with a newer 5 1/2" stainless Bisley. The older Blackhawk had really loose cylinder/throats. This newer revolver has much tighter chambers and the throats seem to be right at 0.451. I am considering sending it off to a gunsmith for an accuracy job, but want to shoot it a little more first. The mold is casting these bullets at about 0.454, but are not concentric. Will I need to size these for best accuracy?