For the price, I would take the chance on it
So would I! Try Remington 'Slugger' slugs. They're mild and shot well in a Tracker I had.
The 12ga ultra slug hunter is made with the same bbl blank that NEF/H&R uses to make their 10ga barrels.
As for the lightweight slug guns or Tracker 1/11 models, they're also excellent slug shooters.
$120-$130 would be a decent price for such guns.