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We present the Democratic Samples of Supernovae (DSS), a compilation of 775low-redshift Type Ia and II supernovae (SNe Ia & II), of which 137 SN Iadistances are derived via the newly developed snapshot distance method. Usingthe objects in the DSS as tracers of the peculiar-velocity field, we compareagainst the corresponding reconstruction from the 2M++ galaxy redshift survey.Our analysis -- which takes special care to properly weight each DSSsubcatalogue and cross-calibrate the relative distance scales between them --results in a measurement of the cosmological parameter combination $f\sigma_8 =0.390_{-0.022}^{+0.022}$ as well as an external bulk flow velocity of$195_{-23}^{+22}$ km s$^{-1}$ in the direction $(\ell, b) = (292_{-7}^{+7},-6_{-4}^{+5})$ deg, which originates from beyond the 2M++ reconstruction.Similarly, we find a bulk flow of $245_{-31}^{+32}$ km s$^{-1}$ toward $(\ell,b) = (294_{-7}^{+7}, 3_{-5}^{+6})$ deg on a scale of $\sim 30 h^{-1}$ Mpc if weignore the reconstructed peculiar-velocity field altogether. Our constraint on$f\sigma_8$ -- the tightest derived from SNe to date (considering onlystatistical error bars), and the only one to utilise SNe II -- is broadlyconsistent with other results from the literature. We intend for our dataaccumulation and treatment techniques to become the prototype for futurestudies that will exploit the unprecedented data volume from upcomingwide-field surveys.

Peculiar-velocity cosmology with Types Ia and II supernovae