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If it was me, I'd still go ahead and (myself) fit a .223 barrel to that receiver, along with either a .357 Mag or .44, and a 12gauge. Thompson/Center BTW, regularly runs their .223 barrels on their Contender (G1 and G2) receivers that at most can only handle 40K psi, .30-30 pressures. No doubt others will chime in. And if that SB1 receiver indeed can handle 40K psi, methinks you'd be good to go!Even if H&R doesn't.
The 223 runs 55kpsi, not 40kpsi, read the following FAQs topic warning about shooting a 223 barrel on a cast iron shotgun frame, it might work, unfortunately is might not with catastrophic results. A Contender has a steel alloy frame, an SB1 is cast iron, big difference.
Best thing about a Versapack frame is that it has the small fireing pin, so it works well on the pistol cals and the Hornet rounds. Larry