My first deer was taken in '88. I was using a Remington 870 LW Mag 20 gauge with a 20" slug barrel and shooting Winchester Super-X 3", 7/8oz, slugs. The shot distance was 50 yards and the mature Doe dropped in here tracks. Easily one of the most exciting hunts I've ever had!
Both of my sons also took their first deer this season.
My oldest son (10) was using a T/C Omega .50 cal muzzleloader topped with Nikon Moarch optics. Shot distance was 30 yards and the small buck dropped right in his tracks!
My youngest son (9) was shooting a T/C Encore Pro Hunter 209x.50 muzzleloader topped with Nikon Omega BDC optics. His shot was just over 40 yards and the small buck ran about 40 yards.
Both boys were shooting 100 grains of Pyrodex and a 250 grain Shockwave bullet and MMP sub-base.