Tim56

Think you will have to do as suggested - bit of suck it and see.

Does not take much Linotype to change the hardness so 10-20% would. Be a good starting point.

If you do a dig on the web you will find quite a lot of information. One thing to be aware of is some alloys change hardness over time (which can range from days to months) so testing a cast bullet might not indicate what it will be when you get round to using it.

Think you will find your old wheel weights had some arsenic in them which means you can heat treat bullets after casting should you so wish (caveat: from memory !)

Brgds Terry