Hypothetically speaking - if the Sporty is SB1 grade, its possible that it could handle it considering the factory centerfire cartridges that were mounted on the SB1 grade in years past(357mag, 44mag, 30-30, 45-70, etc). Possibility that it wouldn't be safe too.. I wouldn't be worried about a barrel rupture or frame stretch, but maybe the case rupturing at the firing pin. Of course a SB2 would be best, however dealing with an offset bore I think would be a turd and a half.
Who knows... I think it's worth a try on a Sporty if someone can vouch for it being SB1 grade.