I have seen many pictures of savage build handguns. However, I live in Illinois and must meet the following requirements for a legal handgun for deer hunting:
The only legal ammunition for a centerfire handgun is (1) a bottleneck
centerfire cartridge of .30 caliber or larger with a case length not exceeding
1.4 inches, or (2) a straightwalled centerfire cartridge of .30 caliber
or larger, with no minimum case length; both of which must be available
with the published ballistic tables of the manufacturer showing a capability
of at least 500 foot pounds of energy at the muzzle.

1. Can I build a 454 Casull or 460 SW mag since they are rimmed? Feeding out of a magazine is not a concern. A single shot would be fine.
2. I have a H and R 20 Ga now but I want something more accurate and cheaper to just shoot and a better trigger. I am tired of the expensive slugs. And the handgun builds look cool. I know I could get a TC contender but everyone has one of those.
Thanks