Steve,
You need a lot more information and a good - or several - reloading manuals before starting to load. IME, half jacket bullets can drive pressures up very significantly.
As to the bullets being all lead - they could be swaged or cast and loading can be dramatically different. You could start with light loads with the lead bullets, but the half jacket bullets will require more care and more punch to prevent a bullet becoming stuck in the barrel - which is not a good thing.
After you have a good manual and all of your components, let's visit again.
Autorim