I am using the Hornady "Lock and Load" system that attaches to my calipers with a thumb screw.

I would like to buy one more insert that Hornady does not make and judging by their email response won't be making until 4 legged animals grow wings.

Specifically I would like a comparator insert around .458-.460" ID for loading 45-70.

If someone has a lathe, some 3/4" aluminum bar stock and some patience please to let me know.

Smething like this: