  We report a study of the scattering of two octet baryons using lattice QCD.
The baryon-baryon spectrum is computed using distillation on eight lattice
ensembles spanning six lattice spacings and multiple volumes, all at the SU(3)
flavor symmetric point with $m_\pi=m_K\approx 420$ MeV. Using finite-volume
quantization conditions, we determine the scattering phase shift and the
presence of bound states. Focusing on the $H$ dibaryon, our results show large
discretization effects: in the continuum, the binding energy is
$B_H=4.56\pm1.13\pm0.63$ MeV, whereas on our coarsest lattice spacing this is
larger by a factor of about 7.5. We also present preliminary results for a
$D$-wave phase shift and for the spectrum in the nucleon-nucleon ${}^1S_0$
channel.
