Why are .410 slugs so light

[Dinny]

   I live in Ohio,  here it is legal to use a 410 for deer hunting. I checked with ODNR about legal issues of a special rifled 410 barrel shooting heavy cast or jacketed bullets and what I found out was ,
   You cannot use a all metal shell case, such as a all brass casing,
   The bullet can protrude from the front of the shell casing ,
   the said gun must chamber and fire 410 shotshells,  Thats here in Ohio.
  Just to play with this a little , I am making a rifled 44 cal. barrel that I am chambering to take a 2 1/2" plastic shell with a 44 cal. bullet loaded uncrimped to try and get a accurate shooting "410 slug gun " that will have the power of a 44 magnum or better from a Mossberg M 500 410 pump shotgun.
  I should have this up and shooting within a couple of weeks. I will post pics and range reports as soon as I get it working.    Jed

Now you're talking! Can't wait to see your results.

Thanks, Dinny