Hello.
Back in 1992 I plotted all the headstones in the churchyard of St.Peter & St.Paul's, Shepton Mallet. Not all the headstones were complete, or readable, but I transcribed what was legible at that time.
Sadly, there were no Snellings recorded, nor any part names that could have been 'John Snellings'.
But this is only the churchyard. The cemetery would have been in use by 1876, but that has not been transcribed.
IJD