steel is required for migratory and for some federal grounds like Wainwright base
Lead shot is permitted for most upland game although many people have switched to non toxic shot due to health concerns over lead shot or lead bullets in game meat. I don't know of a skeet range that insisted on steel shot but most will insist you shoot smaller shot than 6 shot so 7.5 8 or 9 are OK.
Many shotguns shoot both but it is generally the choke of the barrels rather than the age of the gun. Any open choke like IC is generally OK for steel (and lead). Never shoot steel shot through a fixed full choke old shotgun.
My only concern when you state your grandpas gun is that it was designed to shoot old black powder or is damascus barrel both of which will not withstand the pressures of todays modern shot shells. If in doubt have the gun checked by a competent gun smith. l
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 a hunting we will go!!!!!!
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